Music tutoring can provide a quick way to become proficient at playing a musical instrument. Music tutors generally specialize in one or two instruments (ignoring cross-overs like keyboards and pianos). If the instrument you want to play is rare you might find it difficult to find a music tutor in your area that can teach it.
Music tutoring can be great fun. If your child is young you can supplement the music tutoring lessons with home play. There are lots of musical games you can play with your child to give them confidence and interest whilst actively improving their innate musical ability.
Music tutoring can also be used as a kind of therapy. Some children relate very well to music as a calming mechanism. Music tutoring as therapy has proven itself frequently to be highly effective.