Convertible 3/4 tuba for extra versatility. Appropriate to concert or marching band, the convertible models are among the most popular due to their versatility. Kanstul is one of the greatest brass design innovators and Tama has a solid understanding of marching bands' needs. It is an ideal marriage of core competencies that has resulted in a new alternative solution for marching band challenges. Kanstul is one of the greatest brass design innovators and Tama has a solid understanding of marching bands' needs. It is an ideal marriage of core competencies that has resulted in a new alternative solution for marching band challenges.