Summertime

I've done "Over the rainbow," so why not "Summertime?"  It might be possible to say this is the great American song.  I have picked these versions because each singer transforms it to herself.

Ella Fitzgerald

Norah Jones

Billie Holliday

Janis Joplin

Leontyne Price.  For me Leontyne is definitive, but even she has multiple versions.

Such as this one.