Among the most fascinatingly mysterious and audaciously forward-thinking of all record labels is New York’s ESP-Disk, which in the 1960s was in the forefront of recording the New Thing/avant-garde musicians who would eventually change Jazz as we know it. Its now-classic releases included albums by Albert Ayler, Sun Ra, Ornette Coleman and Pharaoh Sanders. Wednesday, local Jazz devotee and record collector Steve Kemme will play and discuss those recordings in a presentation called “Listen to This! Free Jazz on the ESP-Disk Label.”