were influenced by the use of modes in Afro-Cuban jazz, or other branches of Latin jazz . [ clarification needed ] Free jazz and the related form of avant-garde jazz broke through into an open space of "free tonality" in which meter, beat, and formal symmetry all disappeared, and a range of World music from India, Africa, and Arabia were melded into an intense, even religiously ecstatic or orgiastic style of playing. [ 130 ] While loosely inspired by bebop, free jazz tunes gave players much more latitude; the loose harmony and tempo was deemed controversial when this approach was first developed. The bassist Charles Mingus is also frequently associated with the avant-garde in jazz, although his compositions draw from myriad styles and genres. A shot from a 2006 performance by Peter Brötzmann , a key figure in European free jazz A series of recordings with the Classic Quartet in the first half of 1965 show Coltrane's playing becoming increasingly abstract, with greater incorporation of devices like multiphonics , utilization of overtones, and playing in the altissimo register, as well as a mutated return to Coltrane's sheets of sound . In the studio, he all but abandoned his soprano to concentrate on the tenor saxophone. In addition, the quartet responded to the leader by playing with increasing freedom. The group's evolution can be traced through the recordings The John Coltrane Quartet Plays , Living Space , Transition (both June 1965), New Thing at Newport (July 1965), Sun Ship (August 1965),