I actually found Willie the Pimp to be the hardest track to get into on Hot Rats. Peaches en Regalia and Son of Mr. Green Genes were pretty instant though.
Anyways, went down to the public library and found these babies:
Frank Zappa- Trance-Fusion
Santana-Abraxas
Aesop Rock- None Shall Pass
Burning Spear- Marcus Garvey