If I had my wish, I’d see Seth produce an animated movie musical of Guys and Dolls, pulling stylistic inspiration from the Golden Age of animation 1920-1960. Rapid fire, gags a plenty, in that vintage midcentury animation style that has come back into popularity in the last few years. (Hand drawn ideally.)
Seth would then play a dual role: his natural voice as Sky Masterson, and his comedy voice as Nicely. Get Alex Borstein to reprise Adelaide from the concert tour with Seth, and then one of his beloved jazz-pop crossover ladies as Sarah. (I can already hear Norah Jones crooning “If I Were a Bell.”)