Classic Rock, almost entire chorus ooo rhymes with who.
It's a classic rock song/band in the early 80s or 70s,
almost the entire chorus is harmony vocals singing ooo, it rhymes with who, it had a hammond organ in between ooos,
I thought it might be grand funk, the eagles, the grateful dead, humble pie, the allman bros, the doobie bros,
it has a really strong harmony maybe 4 or 5 parts, but it seems a smidgen newer, like mid to late 70s or even the early 80s.