Jmc start from age 4. My kids start with Music Wonderland at 2yo, learning basic rhythm, singing and etc .

Depend on parent. For example we just want to let our kids expose to music and group of kids. But some parent see it as a waste of money, usually quite many drop out in music Wonderland class after a month.

You can wait until 4yo and let your kids start with JMC

JXC is good on hearing and pitch for kid. Where by 1 to 1 class teacher doesn't emphasise that much on that.

JXC can be running parallel together with 1 to 1 class such as piano, violin, cellos and etc.

If your kid finishing JMC soon, you would notice most of the song they can play from hearing and singing. i.e if they hear re mi fa so la / so-ti-re, they would be able to straight away play on piano/electone.