Ren,
My wife played piano from age 6 on to HS. She was one of the top students for the teacher and did a number of concerts. She took up dance and drama in middle school as well. She gave it up when varsity sports, college and work and other interests intervened.
Prior to a concussion in her 20s, she could still sight-play just about everything she learned.
She says that piano gave her self-discipline far beyond what school did. She also thinks it helped her verbal memory. It also made her into a phenomal typist. ( All dance did for her was to allow her own the floor when she goes clubbing. )
