BE CRITICAL: Not all sources are created equal, whether in print or online. Ask questions like who wrote what you're reading, is it peer-reviewed, what sources are they citing, and so on.
BE CREATIVE: Some searching will lead to dead ends, but that doesn't necessarily mean it's an end after all. Those gaps of research are often where interest lies. In other words, don't rehash other's research, but rather use theirs to bolster your own unique take.
BE PATIENT: Research is a fluid process. As you research, your questions will evolve, and that is an excellent sign. If, however, you ever get stuck, ask for help! Your professor and music librarians are always happy to help you think through your process.