Band of an instrumental piece played in march 1971 on a FM station from Muncie, IN?


Starts with an orchestra playing a sort of Overture that as it fades away from the background a drum and a bass guitar comes forward before the lead guitar or electric violin starts playing a fantastic rock piece, kinda progressive kinda clean rock. Haven't stop searching since march 1971 with no luck.
cromagnon7
Was it a long song? Was the radio station a free format station or top 40?

Atom Heart Mother by Pink Floyd released in 1970 kind of fits your description

https://www.youtube.com/watch?v=Fku7hi5kI-c
See what were the top 100 songs from that year or the previous year in that genre.