I agree with Sherrif John Stone that the w/ Symphony in the title, maybe a bigger production was intended.
Highly doubtful - the basic track (without any vocal) was recorded at least a year earlier, and it was Diane who came up with the "Symphony" bit when she wrote the lyric.
I was wondering about that, if Brian titled the song and then gave it to Diane to supply the lyrics, or if the entire concept was Diane's.
I also feel that, for some reason, Carl and/or Al didn't get a hold of the track and finish/sweeten it like was done with many of Brian's late 70's songs. Come to think of it, also his 80's, 90's, and 00's songs too. Maybe they thought it was fine the way it is, or thought it would never see the light of day.
Again, does anyone know if Brian was the only Beach Boy on the recording, and who the musician's were?