In addition to being a wonderful chess player and world champion, Smyslov was also known for his singing. Some other known chess players who love to sing include Portisch and Sutovsky, etc.
Chess Daily News from Susan Polgar
The singing world champion
He’s a good singer.
True story about Portisch—well, what another GM said about him.
Yasser Seirwan once opined that Portisch had zero talent at chess, which I thought was an interesting position to take, given Portisch’s successful career.
What I took from that is that Portisch didn’t think about chess the way Yasser did.