I don’t know of a particular group that needs second-hand musical instruments at the moment. But the old guitars, drums, or clarinet that has been sitting in the corner of your house can make a big difference to musically-inclined children. They can use those instruments to enhance their talent to perform or join future contests. You can ask the church you are affiliated to or schools in your area that may need these musical instruments. If you have extra funds to spare you can check some local music stores for discounted musical instruments. You (future donor) will definitely make a lot of children and adult happy for the gift.