Here is a shortened ("Walls & Abridged") 16-minute version of John Lennon & Yoko Ono's avant-garde, experimental album from 1968, Unfinished Music No. 1 - TWO VIRGINS. 
I've taken 16 minutes' worth of the 30-minute album to give the uninitiated listeners an idea of what can be expected if one chooses to listen to the full album.
I've also included the bonus track, written by Yoko, that was included on the TWO VIRGINS re-release from 1997, "Remember Love." It features only Yoko on vocals and John on acoustic guitar. One may identify bits from The Beatles songs, "Julia," "Sun King," & "Dear Prudence" from John, as he strums on "Remember Love."
Enjoy!

1. Remember Love - Yoko & John
2. TWO VIRGINS Sides 1 & 2 - experimental music consisting of only John & Yoko. Some of the tape loops which appear on TWO VIRGINS are from the collection of John's old Liverpool mate, Pete Shotten (who had recorded these tape loops with John).