The Marshal's leitmotif aka Cobb Vanth's theme
Cobb has his own musical cue (thanks Ludwig!), very Western, percussive, and totally badass - of course to match the character.
The leitmotif is first heard when we (and Din) see him for the first time in the Mandalorian Season 2 premiere. The second time is during The Marshal's Tale flashback when Cobb returns to the Mos Pelgo cantina to wreak justified havoc on the Mining Collective.
Cobb's theme is heard once again during The Book of Boba Fett's Season 1 finale, during the mid-credits/post-concept art sequence. There's absolutely no doubt that's Cobb!
The theme this time ends with a mash-up of The Modifier's music as it pans up to the Mod.
I thought Cobb's leitmotif would play when we saw him in Episode 6's cold open. Instead, they gave us the Mandalorian's "Marshal's Tale" western (acoustic guitar) variation of Mando's theme (dincobb!!) which replays when the Freetown citizens swoop into Mos Espa to join the fight.
