US composer of Rhapsody in Blue (1898-1937) (8)
I believe the answer is:
gershwin
(Other definitions for gershwin that I've seen before include "Ira -; US lyricist" , "George ........ composed ` `Porgy and Bess' '" , "he noted" , "Ira and George, US brother composers" , "Composer of Rhapsody in Blue, d.1937" .)