About 5 years during one of my overnight meet with my regular SP, we took a bubble bath together and we chatted about everything and nothing; Among the random chit chats she mentioned she used to sing as a choir girl at her local church when she was a teenager, and after my urging she sang it to me while we sat face to face, in the bath, covered in bubbles. It was one of the most beautiful singing I have ever heard live.
This is not likely to ever happen, with any other SP, again.