If you want to know more about the "gabagool song," where it came from, how it became The Sopranos theme, check the link...
https://youtu.be/s4gK67BJYVE?t=2155
It's from a YouTube podcast, Talking Sopranos, made by Michael Imperioli (Christopher) and Steve Schirripa (Bobby Bacala) during Covid. They talk about every episode of the show, behind the scenes stuff, funny stories, with guest interviews of all the major characters. If you're a Sopranos fan, it's worth a look.