Jonathan Warburton, international guest bass trombonist from Birmingham, England, will perform in concert at 7:30 p.m. Tuesday, April 1, in Wiedemann Hall. Admission is free. Warburton will play a world premiere and a U.S. premiere in his concert. In addition to his solo career taking him to such diverse venues as Australia, South Africa, Poland and Canada, he plays with the BBC Big Band and BBC Symphony.