Google yielded a few varied results in books:
From a book titled Sefer Yetzireh by Rav Aryeh Kaplan: The seven Sciences – Grammar, Rhetoric, Logic, Arithmetic, Music, Geometry, and Astronomy. Footnote for source not available for free.
From Encyclopedia of Jewish Medical Ethics: A Compilation of Jewish Medical Law … By Avraham Steinberg: The medieval scientists listed seven branches of knowledge – Logic, Mathematics, Measurements, Natural Science, Astronomy, Music, and Theology. The footnote claims this is from Rabbenu Bachya on Avos, end of Perek 3, and Maharal Nesivos Olam, Netiv Hatorah, Perek 14.