Rarely has any rock band, much less one that already had some years, various singles and two full albums already under their belt, released a record that was essentially a collective effort from any number of performers, producers and DJs. But that’s why Screamadelica succeeds: building on the pivotal Andy Weatherall-remixed single “Loaded,” Bobby Gillespie and company took in everyone from the Orb to singer Denise Johnson, who has a great lead turn on “Don’t Fight It (Feel It),” to create a dance-party-into-morning-comedown delight.’’