For names of duos, trios and music groups, record labels almost always use the ampersand instead of the word "and." Examples: Sonny & Cher, Paul & Paula, James & Bobby Purify, Hootie & the Blowfish, Booker T & the MG's, Sly & the Family Stone. That is also the way those names appear in the Billboard music charts. However, there were many exceptions in the 1940s and '50s. e.g., Ferrante and Teicher, Dion and the Belmonts, Rosie and the Originals, Glenn Miller and His Orchestra, Nelson Riddle and His Orchestra.
Some groups avoid both the "and" and the ampersand, such as Guns N' Roses, Sniff 'N' the Tears, and Mike + the Mechanics...and one 1990s dance group has been known variously as C+C Music Factory, C + C Music Factory and C & C Music Factory. Such indecision!