Google Scholar can be a useful searching tool, particularly when it checks against the electronic full text holdings at FSU. This link requires you to log in with your FSU e-mail information-- but it's worth it!
Examines Western musical performance practices across all instruments.
Piano & Keyboard (continues Piano Quarterly). FSU Allen Music Library Periodicals 780.5 P581
Piano Guild Notes. FSU Allen Music Library Periodicals 780.5 P485
Locating articles on specific topics
Music Index primarily indexes journal articles, and generally indexes more materials relating to education and pedagogy.
A search for piano and instruction and study rather than piano pedagogy provides better results in this resource.
RILM Abstracts indexes articles, books, dissertations, essays in books and more. Because of its international focus, search results from RILM are often in many different languages. RILM is often a great resource for historical and theoretical articles.
PsycInfo indexes articles in psychology, but also related fields such as music education and music therapy. You can use the "Methodology" option under "limit your results" to search for articles using specific kinds of research methodologies (e.g. empirical, literature review, qualitative, quantitative). Be sure to scroll down the page to get to it! PsycInfo is a great place to start your research!