Note: Not all fake books or real books have the same format, most will have sheet music with chords marked, some also have lyrics, a few have tablature, they are sometimes also available in different keys and arrangements to suit different instruments.
For an excellent collection of fakebooks to buy, checkout www.sheetmusicplus.com, who have a selection of some 1200+ to chose from, they also have good search facilities AND include content indexes for their books.
Song/Tune Title
Book
I Wonder Why
BFBE
I Wonder Why
RLBFB
I Would Be Like Jesus
HFB
I Would Be True
HFB
I would climb the highest mountain
MACU
I would Do Anything
RLUBFB4
I would Do Anything
UBFB
I would give a million tomorrows (for just one yesterday)
MFFB
I would have Baked A Cake(If I Knew You Were Comin')
BFBE
I would have Baked A Cake(If I Knew You Were Coming)
RLBFB
I would Like To Be In Texas
FFB
I would like to teach the world to sing (In perfect harmony)