This article is from the James Taylor FAQ, by Joel Risberg (email@example.com) with numerous contributions by others.
From Ken Kwartler (firstname.lastname@example.org):
JT & the gang had purportedly written and recorded all the other songs for
Sweet Baby James, but needed one more. JT strung together a few different
pieces he was working on into one song, and named it Suite for 20G, as once
they recorded it and gave the record company the finished project, they got
a $20G advance.