Abstract: Personal Portable Groove Generator device (MP3/PDA/Cellphone form), software and website operation for truly novice Users to create unique musically complete compositions, automatically or User-generated, through menu-directed selection from loop libraries to mix and build novel, complete, rich, musical Grooves that can be audited, saved, up/down loaded, evolved, and shared, P2P or via a community or other website, on a free or subscription-type basis. In AUTOPLAY mode, the device automatically creates the composition by random selection of compatible loops once a STYLE has been selected by the User. In CREATE mode, the User builds a musical Groove by combining loop tracks. The User listens-to and selects successive categories of loops that are compatible in key, tempo and style, and each chosen loop is digitally combined with prior loop(s) to create the savable/sharable Groove. In addition to general popularity, the system has particular utility in the Music Therapy and Music Education fields.