You will find many basic resources and those covering multiple topics repeated in the specialized guides as appropriate. In most cases, we have amended the description to briefly summarize how the cited resource (or parts from it) refer to the specialized topic at hand. For example, how RISM handles subject access to the topic (rather than just a general description of RISM) or links that point to relevant specific articles in encyclopedic resources covering many topics in music (such as Oxford Music Online).
