Many children enjoy playing on toy musical instruments. You can use your signs to label the instruments. As your baby gets older, you can play games where they have to identify the instrument from hearing the noise.
Instrument signs like drum can be taught through a variety of senses. Let them play a drum, see the drum on the flash card, and hear the drum. Bringing in all these senses will make the experience more memorable, and give your baby a better understanding of what a drum is and how it works.