** 1/2 Crosby, Stills & Nash, “Live It Up,” Atlantic. Crosby, Stills & Nash--<i> party dudes</i> ? :<i> Albums are rated on a scale of one star (poor) to five (a classic). : </i>

That seems to be the intention on the trio’s fourth studio album in 21 years. Despite the title track’s boom-box mix, the album’s occasional rewards are in songs that revive the CSN sound of yore. Nifty hot dogs on the cover art, though, dudes.