88 Keys (www.88keys.ca) does kindermusik classes - they are at Leslie and Hwy 7 in Richmond Hill. They have Saturday morning classes which are pretty busy, and perfect for working parents.
We took Zoey when she was 11-13 months old and she really enjoyed it. The director, Eileen, led the 'Village' (newborn to 18 months) class and also facilitated a kindermusik session for Zoey's first birthday party, which was great fun.
After our first session, Eileen had to sub for another Saturday morning class and she did not have another teacher for the 'Village' class, and then they suspended that class for the summer. So we will be rejoining and going to the 'Our Time' (18 months -3.5 yrs) class in the Fall.