The Mills Brothers: The 1930s Recordings. Long before the Mills Brothers were a middle-of-the-road quartet known for their close-harmony ballads, they were a smooth-toned, hipper-than-hip vocal group billed as “four boys and a guitar” that Lester Young once wittily described as “the best saxophone section I ever heard.” Their first 116 recordings, pristinely remastered by John R.T. Davies, have been collected in this low-priced five-CD set that abounds with musical riches, including guest appearances by Louis Armstrong and Bing Crosby. The listening is easy, but the swinging is hard (TT).