音楽専科社 is the business in Japan founded in 1966.
According to PR-model, ongakusenkasha.co.jp is ranked 740,100th in multilingual Wikipedia, in particular this website is ranked 563,548th in English Wikipedia.
The website is placed before worldhazaracouncil.org and after iceboat.org in the BestRef global ranking of the most important sources of Wikipedia.