PRIMA MATERIA - La Coda Della Tigre LPPrima Materia was a vocal improvisation ensemble, founded by Roberto Laneri in 1973. Composed entirely of vocalists with no academic training, the group developed various techniques revolving mostly around the use of overtones that would embody their unique sound. No instruments nor electronic manipulations were ever employed within the group's physiognomy, which was realized purely through the human voice. La Coda Della Tigre, the group's sole album,