Trey Songz — Can’t Help But Wait

 Capo on 4 to make it easier.

Main melody:
|--7---7---7-----7---5---3--2----2---0-- 0----0---2--3--5--|
|-----5---5-----5---------------0---0--- ----0-------------|
|----7---7-----7---------------2---2---- ---0--------------|
|--------------------------------------- ------------------|
|--3---------0-------------------------- ------------------|
|---------------------------0----------- 0-----------------|

Chords:

Without capo

Intro, verse, chorus: 
Emaj C#m G#m G#m

Pre-chorus: 
Amaj G#m Amaj D#maj

Bridge: 
Amaj Amaj G#m G#m
F#+ F#+ D#maj D#maj

With the capo on 4 it looks like this:

Intro, verse, chorus:
C Am Em Em

Pre-chorus: 
F Em F Bmaj

Bridge: 
F F Em Em
D D Bmaj Bmaj