In a concert tour worth catching, post-classical string quartet Ethel, along with multiplatinum artist Todd Rundgren, presents “Tell Me Something Good,” a show built around the music that made the 1970s rock. These five musicians will take the stage Sunday in the Clarice Smith Performing Arts Center’s Kay Theatre on the University of Maryland campus.

This is a combination that proved so successful in its initial collaboration on a European tour in 2005 that a second go-around was inevitable.