This is the natural progression of 'Tonight Show' host Jimmy Fallon's assorted warblings and big-time musical impressions: a full-scale musical medley co-starring Barbra Streisand. The songstress has a new album out -- her 34th! -- that's titled 'Partners' and features just a mess of duets between Babs and a bunch of male partners. Get it? Partners?

Turns out, none of them could make it on 'The Tonight Show' last night (perhaps because some of them are dead?), and Fallon stepped up to take their place. The funnyman is basically Elvis Presley right now ... and also Blake Shelton ... and Michael Buble. He can do it all, and we no longer have any need for other male singers.