In support of "Sound Theories Vol. I & II" and "Visual Sound Theories", Vai put together a new band for a five-month world tour of the United States, Europe, South America, and Australia. While evaluating unique options for the band (which included ideas for a horn section or percussion section), Vai began auditioning violin players to complement the new lineup. This new band, known as the String Theories band, featured previous The Breed members Jeremy Colson (drums) and Dave Weiner (guitar and sitar), along with new members Bryan Beller (bass), Alex DePue (violin), and Ann Marie Calhoun (violin). During a month of twelve- to fifteen-hour a day rehearsals, Vai and the band perfected the performance (which consisted of pieces from Vai's catalog, arranged by Vai to include the two violins). The tour began in June 2007 and ended in December the same year.