Discussed are findings of a review of 21 research reports concerned with the use of environmental music with mentally retarded persons. It is explained that the literature in two data bases was searched and relevant reports examined. The reports are organized into general findings (seven reports), use of music in contingency management (nine reports), and behavior changes of the retarded as a function of different types of music (five reports). Among conclusions is that the most appropriate musical program for a retarded population has a medium tempo with a bright overall stimulation value which uses an ascending curve of stimulation and maintains a high degree of novelty. (DB)