Kids always wanted to explore new things and in their environment. It's actually healthy for them to learn and experience new things in their lives as it is where they can gain more knowledge that can help them. Not all kids also like music and to play an instrument so it's kinda refreshing and exciting to see if a kid is interested in it.
If parents noticed that they are showing interest in playing the guitar, piano, drums or any musical instruments, I reckon it is best for the parents to encourage and support them. Who knows they might excel in that field and even made them as a career in the future. Sending them to music classes can greatly help the kids to hone their skills and express themselves. You can also get them guitars piano or any musical instrument that they have interest in.
Never force your kids to learn something that they are not passionate about for they will not excel on that field if they lack interest.