Thanks for the post!

The begining reminds me of something, not sure what… anyway, awesome intro!

The 5th Dimension combined two songs from the iconoclastic 60’s musical “Hair” – this is actually a “show tune” written for the revolutionary 60’s rock musical “Hair” that became an essential part of any discussion of the Hippie movement, anti war protests, free love and psychedelia,

https://genius.com/The-5th-dimension-aquarius-let-the-sunshine-in-lyrics

I also like this song:

The 5th Dimension - (Last Night) I Didn’t Get to Sleep at All (Official Audio)

https://www.youtube.com/watch?v=niwt47gHtmM

edit2: format