>>4 Considering FLCL is only a 6 episode OVA, you've got nothing to lose, and (as Yata and I have harped on about) the music is top notch.
I guess I also could have also mentioned Kids on the Slope - it too has amazing music, but what else would you expect from Yoko Kanno? Most of the songs are covers or rearrangements of jazz standards, with specific callouts to certain seminal albums and artists of the genre.
The entire series is a love letter to jazz.