Friendship Classifieds

My family and I are moving to Pittsburgh in August.  I would like to enroll my two daughters, ages 4 and 6, in dance classes this fall (my eldest is particularly interested in ballet and tap).  If anyone has recommendations or feedback for places that offer classes, I would greatly appreciate it.  I am hoping to find somewhere that offers high quality lessons in a kid-friendly (not crazy competitive) environment.  If you have any suggestions, please let me know.