A salsa version of the Gershwin tune, with vocal head, piano solo, and some scat singing! According to composer George (referring to he and his brother, lyricist Ira), "...the title covered part of the first bar only, and there was many a hot argument between us as to where the accents should fall in the rest of the words."

Source:
http://www.cafesongbook.com/pages/songs/f/fascinating_rhythm.html