RT Journal Article SR Electronic T1 Computer-Aided Collaborative Music Instruction JF Harvard Educational Review JO herp FD Harvard Educational Press SP 270 OP 279 DO 10.17763/haer.61.3.h161460535717722 VO 61 IS 3 A1 Hoffmann, James YR 1991 UL http://harvardeducationalreview.org/content/61/3/270.abstract