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. 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. The first major stirrings came in the 1950s, with the early work of Ornette Coleman and Cecil Taylor. In the 1960s, performers included John Coltrane, Archie Shepp, Sun Ra, Albert Ayler, Pharoah Sanders, and others. Free jazz quickly found a foothold in Europe – in part because musicians such as Ayler, Taylor, Steve Lacy and Eric Dolphy spent extended periods in Europe. A distinctive European contemporary jazz (often incorporating elements of free jazz but not limited to it) flourished also because of the emergence of musicians (such as John Surman, Zbigniew Namyslowski, Albert Mangelsdorff, Kenny Wheeler and Mike Westbrook) anxious to develop new approaches reflecting their national and regional musical cultures and contexts. Keith Jarrett has been prominent in defending free jazz from criticism by traditionalists in the 1990s and 2000s.