 Large rooms were also more common in the Swing era, because at that time, jazz was popular as a dance music, so the dancers needed space to move.With the transition to 1940s-era styles like Bebop and later styles such as soul jazz, small combos of musicians such as quartets and trios were mostly used, and the music became more of a music to listen to, rather than a form of dance music.As a result, smaller clubs with small stages became practical.