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I'd say Narikos first unlocked song is the best one
Sweet Tooth, Rachet and Kratos (His second music is EASILY recognisible)
Sly's are pretty good too.
Sackboy's because when you hear it, the first thing you think is "I just got beaten by a burlap sack."
All first of Dante, Heihachi and Radec
Emmetts "Just Business", Kats "A Queen and her Cat", Narikos "Daughter of Shen", Isaacs "Deadlocked", and Big Daddys "Little Sister's Savior".