It should be easy because it was very popular. I heard it countless times, but I’m not a fan of pop/rock, so I never knew its title. It’s from 1970 or thereabouts.
This is the opening of the song.The song opens with only trumpets (I think) in unison. Tempo is a little under quarter note = 120 MM.
c4 e4 g4 c’4 a,8 a,8 c8 c8 e8 e8 a4 a-,8 a-,8 c8 c8 e-8 e-8 a-4 g8
4 = quarter note, 8 = eighth note.
’ = octave above middle C
, = octave below middle C
- = flat