The Chicago Manual of Style is the preeminent citation style used in the humanities, especially for music. A simplified version by Kate Turabian is geared toward students. APA and MLA are two other popular styles for academic writing. The important thing is to be complete and clear, and to use one style consistently throughout your work. Plugging a URL into a citation machine is a great convenience, but the result must be proofread. Pasting a reference from another author's bibliography may also require some polishing to make it match your other citations.
Please see our citation style guide for Chicago/Turabian for detailed examples.
Key terminology:
The Chicago Manual of Style Online
Zotero -- "Zotero is a free, open-source research tool that helps you collect, organize, and analyze research and share it in a variety of ways"
Purdue Owl -- This is a wonderful reference guide for using the Chicago Manual of Style