My great-grandfather Heinrich had played the cello in an amateur string quartet in the 1920s to 1930s, and I was told that when he died in 1958, a cellist played the Ave Maria at his funeral.
While the piece is quite famous as a song, I recently started to wonder what the cello version sounded like and if I might be able to play it. I found a very easy adaptation for cello alone (in F major) that I can actually play (adagio happens to be my favourite tempo, too).
More interesting is this version for cello and guitar. (I'm a bit confused about the key, but I think it is in A while the original song is in Bb.)
So there's something left to aspire to once I get bored with the easy version ...