Johnny Cash's fourth project with producer Rick Rubin continues on the same path as many of their previous releases: Cash's warm and rumbling baritone over minimal production and gentle duets with some surprising guests. One of the things that sets American IV: The Man Comes Around apart from the others is Cash's song selections. The success he experienced with his previous interpretations of contemporary songwriters (Soundgarden's "Rusty Cage," Nick Cave's "The Mercy Seat") is applied to this album with varying degrees of success. His throaty reading of Nine Inch Nails' "Hurt" easily fits into his "Man in Black" persona, and the spiritual conviction underlying Depeche Mode's "Personal Jesus" is certainly powerful.

As an Australian, guitar virtuoso Tommy Emmanuel doesn't seem to be much bothered about musical categories. Is his music jazz, folk, bluegrass, new age? Depending on the track, it can be any one. Like his mentor, Chet Atkins, Emmanuel is simply a guitar player, and on Little by Little, a two-CD set, he sticks mostly to acoustic guitar, playing mostly originals, tunes that he has used in concert but not recorded before. He is also mostly solo, although the double-disc length allows him room to share space with guests including singers Pam Rose (on her co-composition "Haba Na Hava") and Anthony Snape (on the folk-rock "Willie's Shades"). Among the covers are two versions of "Moon River," one with a bass countermelody, the other with an Emmanuel vocal, Carole King's "Tapestry," Atkins' "Mountains of Illinois," and "The Tennessee Waltz." Emmanuel plays fast runs, slows down for delicate passages, and adds harmonics on tunes that evoke players including Will Ackerman and John Fahey. He also likes folk-pop; "Papa George" needs only a James Taylor vocal to fit into that category. But Little by Little is a tour de force by a musician who usually leaves categories behind.

To get an idea of exactly how many Ronnie Milsap collections are on the market, just turn to the back page of the booklet for RCA/Legacy's 2006 double-disc set The Essential Ronnie Milsap, where it lists other Ronnie albums you might also enjoy. There are ten listed, all but one of them a compilation (that would be his very, very good 2006 comeback, My Life). Which begs the natural question, is The Essential Ronnie Milsap needed? Especially since there is already another compilation called The Essential Ronnie Milsap (dating from 1995), and there already was an excellent double-disc set called 40 #1 Hits released six years earlier? The answer is, yes it is, particularly since 40 #1 Hits has fallen out of print. Of course, it also helps that Essential is an expertly chosen and sequenced collection of Milsap's best work, from 1973's "(All Together Now) Let's Fall Apart" and running all the way to 1989's "A Woman in Love."