Lullabye
Fall Out Boy
This is my first tab. Its not exact, but it gives you a good idea.
It's easy once you get used to it.

Intro/Verse x4
       xabout5         x1         x1         x1
|-------3----|-----3-----|----2-----|----3-----|
|-3--3---3-3-|--3----3-3-|--3---3-3-|--3---3-3-|
|------------|-----------|-------2--|----------|
|------------|-----------|-0-0------|----------|
|------------|-3-3----3--|----------|-3-3---3--|
|--3--3---3--|-----------|----------|----------|

Chorus
Patrick uses the same chords here but different picking. im still trying to figure it 
Until then, just strum G,Cadd9,D,Cadd9.

Verse x2
Chorus
Verse x2

End on Cadd9