I appreciate the Fleetwood Mac comparisons, sure, and this scratches my prog itch, but it's the sound of katydids whispering (fullly voiced around the 5:20 mark) that got me glued to this 1976 track from these English rock/folk/prog-ers.
Seems like this album diverges from their original, harder sound, brought to the world's attention when they opened for Deep Purple. I've dipped into early 70s Wishbone briefly and find it's closer to the Allman Brothers than this '76 stuff is to the Mac. Wah-wah, guitars.
I'll take nighttime summer bug chatter over that any day.