What song did Alessandro Juliani sing in Battlestar Galactica?

Alessandro Juliani, who played Dr. Gaius Baltar in Battlestar Galactica, didn't actually sing in the show. He was known for his acting skills, not his singing voice.

The most famous song associated with Battlestar Galactica is "All Along the Watchtower," which was performed by The Battlestar Galactica Choir and used prominently in the show.

It's possible you're thinking of a different song or a different show. Could you provide more context?