Worthing Music Centre will use money donated by Waitrose to subsidise concerts for young musicians.
The not-for-profit independent company was selected for one of the monthly charity collections at the Worthing store.
Having received the highest amount of green tokens in the May vote, the music centre recently received a cheque for £450.
Sally Sanderson, area leader, said: "This money will go towards buying music for the ensembles and subsidising concerts for the young musicians in the next academic year."
The music centre is run by West Sussex Music. Its teachers provide opportunities for 400 young musicians who sing and learning instruments in Worthing schools to come together to enjoy music making.
Sally added: "We offer a wide range of activities for all ages and abilities from pre-school children to young adults. Whether it is a percussion ensemble, string orchestra, wind band, choir or Rock Academy, we have a group to suit children's needs."
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