I don't think I've heard anyone mention the finale from Fauré's sonata for cello and piano no. 1 as a source for Giant Steps, and I suppose we'll never know, but still ...
The fun starts just after the 30-second mark and continues throughout. What do we think?
This would be an unsurprising composer and piece for Coltrane to have been listening to, or maybe even playing (given the cello's register).