Here is Jacqueline du Pré, a supremely gifted cellist, playing beautifully. Haydn’s first cello concerto, which was long lost before being rediscovered in the 1960s, is a gentle, soothing piece that seems simpler than it is. The video is of the entire adagio. It’s worth the 10 minute commitment, if you have the time.
[This performance seems to be from EMI CDC-7-47614-2 — down to the audible pop you will hear about one-fourth of the way through. Sound quality is not stellar, but it’s OK, and the musicianship more than compensates.]