Ethel. Photo by James Ewing.

The string quartet Ethel refers to itself as a "band" and uses amplified classical instruments and improvisation. It's called a "post-classical" ensemble, and the group has toured with Todd Rundgren and appeared on guitarist/songwriter/singer Kaki King's 2012 album Glow.

Ethel is the very definition of "crossover," and if all that doesn't scare you, try this sample from Pitchfork.com's (strongly positive) review of Heavy, its 2012 record: "The violins peel off into glass shards, and the cello starts moaning. It's a relief from the opening melee, but only insofar as scalp-prickling fear that there is a serial killer lurking in your home is technically preferable to the certainty of being stabbed to death."

At Ethel's April 12 performance at St. Ambrose University, don't expect quite that level of eclecticism. Or violence.

But the Present Beauty program Ethel will play still covers plenty of territory on the theme of "what it is to experience beauty from different angles," said violinist Tema Watstein in a phone interview last month.