Reinforcing E.S.L. with Los Cumbancheros Choral Performance Group was a state-funded program functioning at seven elementary and junior high schools in the Bronx (New York) in 1992-93, its fifth year. the program served 244 Latino students primarily of limited English proficiency (LEP); a few English-proficient and special education students were also served. Participants performed in a variety of multicultural activities, 152 of them in a choral group and 92 in percussion groups. Spanish native language arts (NLA) and English as a Second Language (ESL) instruction were offered in music and music theory classes. Los Cumbancheros also provided staff development and parent involvement activities. The project was successful in meeting its objectives for ESL and NLA in music theory, and for Spanish and English oral language proficiency. It also met the objectives for staff development, cultural/education activities, and parental involvement. Recommendations for program improvement include providing additional staff to assist in collecting quantitative data and developing appropriate assessment tools to document student achievement. (Author/MSE)