“Cambridge 1969” is a 26-minute track that serves as the intro for John Lennon & Yoko Ono’s second experimental album, Unfinished Music No. 2: Life with the Lions.

The track features a recorded performance by John Lennon & Yoko Ono from February 3rd, 1969, which was the duo’s first released performance ever and the first performance by a Beatle without the rest of the band since their main line-up’s formation.

Fun facts:

1. Throughout the performance, Lennon kept his back to the audience.

2. The original version of the piece was longer.