Manhattan College of Music professor and Expert double bass participant Timothy Cobb training a bass lesson during the late 2000s. His bass has a reduced C extension by using a metal "machine" with buttons for playing the pitches to the extension. People aiming to be Specialist musicians, singers, composers, songwriters, https://plusdevuesyoutube41392.ka-blogs.com/80524865/an-unbiased-view-of-music