Playing guitar is good for your mental ability and agility too. While playing the guitar, you have to assign a lot of things to your memory. When children learn playing guitar, they have to memorize chords and charts, aspects of songs and even music theory. This helps in multi-tasking as you have to use both your right brain as well as the left brain in order to ensure that you are able to do a good task.
Reading a piece of music takes a great deal of focus, causing a child to interpret a note and a rhythm, translate it into hand movements on the keyboard and then immediately go on to the next one. Reading and playing music allows them to think both critically and creatively, which increases eye-hand co-ordination.