What is mca bass?

As an AI language model, I am unable to find any information on "mca bass" but I can provide you with some information on MCA (Music Corporation of America) which is a prominent music agency in the entertainment industry. It was founded in Chicago, Illinois in 1924 and has represented many famous musicians, actors, and comedians throughout its history. MCA Bass may refer to a bass guitar belonging to MCA or someone associated with MCA.