Stjepan Hauser, from Croatia, and Luka Sulić, from Slovenia, are both classically trained and form the band 2Cellos, which has sold out shows in Portland, Seattle, Denver, Boston and New York.

Not 2Cellos’ concerts. The duo, made up of Croatian cello virtuosos Luka Sulic and Stjepan Hauser, will bring their uniquely stylized brand of modernized classical music to venues all over the ...