Maryland heavy-rock quartet Clutch has shifted gears a handful of times throughout its 20-plus-year career, varying style and approach from one album to the next, all while keeping two things consistent.

Maryland heavy-rock quartet Clutch has shifted gears a handful of times throughout its 20-plus-year career, varying style and approach from one album to the next, all while keeping two things consistent.

"We're a rock 'n' roll outfit," drummer Jean-Paul Gaster told The Beat.

"Regardless of where a person comes from, whether they're a grandmother or a second-grader, they can get what we do. We play rock 'n' roll music, encompassing all the things I grew up listening to."

In addition to eschewing sub-genre descriptors, Gaster's band has given concert-goers a unique experience each night, preferring to change its set list for every show rather than script its live performances.

"Each night a different band member does the set list. The fans have come to appreciate it, that what they're seeing is completely unique," Gaster said.

Choosing that list has become more difficult as the band has added to its repertoire over the years, most recently courtesy the completion of a record to be released later this year. Gaster said he expects the band to play a couple of tunes from the record on its summer tour. He said that, once again, this record marks a shift from its previous effort, Earth Rocker.

"For Earth Rocker, we were attempting to make a high-energy record from beginning to end. For the new one, there's a greater use of different tempos and feels, and a greater dynamic range. There's some straight-up stuff, but some shuffle feel and some blues and funk styles.

"When we were young, we were just hoping to make good records and play good shows. We still subscribe to that, but we feel like we've gotten better as a band, so we're trying to give more to the audience while still giving people a good time at a rock 'n' roll show."