If you care, here is a transcription for Led Zeppelin`s Ramble On
 (Note: I am doing this without my bass so there may be a couple mistakes; 
 Listen to the recording for the timing.
 G       7/11 11/9   | 	7/13 13/11 11/9     | 	 6 9 6      :|
 D   9 7           11|  			11 9| 7 9 	9   :|
 A 7 		    | 7			    |		    :|
 E		    |			    |		    :|
 ^this is the verse.  Watch for variations, as Jones sometimes omits the D 
 flat at the end of the 1st phrase
 G		     |	                 |
 D		     |			 | 
 A	    6 77 76  | 		6 77 76  |
 E 0 2 4 5 7 	   7 |0 2 4 5 7 	7|
 ^this is the pre-chorus - be careful, the timing is tricky
 G
 D     9			 14    12      12    13 14	
 A 7 7   7	12 12 12    12 	 12 12    12 
 E	  0 2 4 
 ^this takes some practice to get right
 unfortunately, on the bridge it is hard to hear the bass, but the 
 progression is |A|A/E|A/G|A|A/E|A then back to the verse
 with hammer ons, something like
 D 6h7 6h7 
 A	   5h7 5h7
 and then repeating.  Sorry if there are any mistakes :-)
 

 

 The main acoustic riff is Riff.1.  This is the basic feel 
for the riff and you can add your own variations to make it 
sound more full.  The chord changes are 
E (E5)  E7sus4  Esus2 | A  Asus4  A  A9
 
Riff.1 
 E-|---------------0----------|-----0----------------------0-------------| 
 B-|--9---------0--0----------|--5--5----5--5--5--5--5--5--5--------0----| 
 G-|--9---9--9--7--9----------|--6--6h7--7--7--7--7--7--7--6--6--6--6----| 
 D-|--9---9--9--7--7---0--0---|--7--7----7--7--7--7--7--7--7--7--7--5--7-| 
 A-|--7---7--7--7--9---0--0---|--0--0----0-----0--0--0--0--------0-----7-| 
 E-|---------0------------0---|----------------------------------------0-| 
 
Riff.1 
 E-|--------------0---------0--------------|----0------------------------------| 
 B-|--------9--9--0---------0--------------|----5----5-5-5---5---5--5--5----5--| 
 G-|--7/9---9--9--7--7-7----9--9-9-9-------|-6--6h7--7-7-7-7-6h7-7--7--6h7--7--| 
 D-|--------9--9--7--7-7-7--7--7-7-7--0--0-|-7--7----7-7-7-7-7---7--7--7----7--| 
 A-|--9/11--7--7--7---------9---------0--0-|-0-----------0---0---0--0--0----0--| 
 E-|-----------0-------------------------0-|-----------------------------------| 
 
Riff.2 (electric) is a clean electric fill during the lyrics, 
"Ah, sometimes I grow so tired, but I know one thing I`ve got to 
do!"  Riff.2 (acoustic) is the acoustic part played behind 
Riff.2 (electric).  The chord pattern is 
E  F#m7  G#m7 | A  F#m7  E  
 
Riff.2 (electric) 
 E-|-0---0-----0------------|-------------0---0---------|-0--------0-----------| 
 B-|-0----0-0--0---0-0----0-|-0----0--0---0-0---0-------|---------0--0--0-0---0| 
 G-|-11-----9--9-----9h11---|-7p6-----6p4---------------|b11(13)p9---9----9h11-| 
 D-|------------------------|---------------------7p6---|----------------------| 
 A-|------------------------|-------------------------7-|----------------------| 
 E-|------------------------|---------------------------|----------------------| 
    ^play this measure the                              ^ extra addition to 
     first time -- goto the                               measure one to give 
     end measure after that                               the bend in the riff 
 
Riff.2 (acoustic) 
 E-|-4---------------------------|--0----------------0-| 
 B-|----------2------7-----------|--5-----------2----0-| 
 G-|-1--------2------4--4--4-----|--6-----------2----1-| 
 D-|----------2------4--4--4--0--|--7--7--------2----2-| 
 A-|-2--2-----4------6--6--------|--0--0-0--7---4----2-| 
 E-|-0-----0--2--0---4-----------|----------0---2----0-| 
 
These two riffs go on top of each other to make the sound more full.  These 
start at "Ramble on, now`s the time, the time is now.  
Sing my song..." 
 
Riff.3 (electric) 
 E-|--------------------|-----------------------------2---2--3-| 
 B-|-9------------------|--3/5-----5--53---3--3------3---3--3--| 
 G-|-9--9--9--7--9-----|-------------------------0-------2-----| 
 D-|-9--9--9--7--7-----|--5/7--------75------5--0--------------| 
 A-|-7--7--7--7--9-----|---------------------------------------| 
 E-|--------------------|--------------------------------------| 
 
Riff.3 (acoustic) 
 E-|--------------------|-------0----------0---0----------2--3-| 
 B-|--------------------|----5--5--5--53--3---3----------3--3--| 
 G-|-9--9--9--7--9-----|-------0--0-------0---0--0-0-----2--0--| 
 D-|-9--9--9--7--7-----|----7--------75---------0-0-----0------| 
 A-|-7--------7--9-----|---------------------------------------| 
 E-|--------------------|--------------------------------------| 
 
These riffs are for the first solo.  They harmonize quite nicely. 
 
Solo.1 (gtr1) 
 E-|---------|-----------------------------12-----------| 
 B-|-15------|-15p14h15--15p14h15-15p14h15-----15-14-15-| 
 G-|---------|------------------------------------------| 
 D-|---------|------------------------------------------| 
 A-|---------|------------------------------------------| 
 E-|---------|------------------------------------------| 
 
Solo.1 (gtr2) 
 E-|---------|------------------------------------------| 
 B-|-12------|-12p10h12--12p10h10-12p10h12-14--12-10-12-| 
 G-|---------|------------------------------------------| 
 D-|---------|------------------------------------------| 
 A-|---------|------------------------------------------| 
 E-|---------|------------------------------------------| 
 
Here is the second harmonized solo. 
 
Solo.2 (gtr1) 
 E-|-12-------------12-------------12------|-12--------------------------------| 
 B-|---15-14-12-------15-14-12-------15-14-|---15-14-12----12-14--12-14--12-14-| 
 G-|------------14-------------14----------|------------14---------------------| 
 D-|---------------------------------------|-----------------------------------| 
 A-|---------------------------------------|-----------------------------------| 
 E-|---------------------------------------|-----------------------------------| 
 
Solo.2 (gtr2) 
 E-|-------------------------------------|-----------------------------------| 
 B-|-14p12---------14p12---------14p12---|-14p12-----------------------------| 
 G-|------14p11---------14p11---------14-|------14p11----11-14--11-14--11-14-| 
 D-|-----------14------------14----------|-----------14----------------------| 
 A-|-------------------------------------|-----------------------------------| 
 E-|-------------------------------------|-----------------------------------| 
 
This riff starts at the end of the second harmonized solo.  
The first acoustic riff (Riff.1) is played behind Riff.4. 
 
Riff.4 (electric) 
 E-|------------------------------|-----------------------------| 
 B-|------------------------------|-----------------------------| 
 G-|--------9--9--9---------------|------9-9--9--7---7-7-7------| 
 D-|------9-9--9--9-------9-9-----|-9h11-----11--7h9-----9--6-7-| 
 A-|-9h11-----11--9--9p11-----11--|-----------------------------| 
 E-|------------------------------|-----------------------------|