Ken Tucker

Skaggs became a mainstream country music star in the 1980s, but in recent years, he's become more interested in performing in a traditional bluegrass style. Ken Tucker says the tracks on Skaggs' album Mosaic "don't just fit together -- they lock into place with a firmness."

Perry has released what is commonly considered the pop hit of the summer, a song called "California Gurls." Perry has a new album, Teenage Dream, which rock critic Ken Tucker says is just one part of what he calls "the Katy Perry art project."

Stuart has been playing country music professionally since his early teens. From the mid-1980s to the early '90s, he had a lot of mainstream country-music success. But in recent years, Stuart has migrated toward an old-fashioned sound. Rock critic Ken Tucker reviews his latest album, Ghost Train: The Studio B Sessions.