Wikipedia has a nice glossary of terms used in music theory and lots of linked articles: https://en.wikipedia.org/wiki/Glossary_of_musical_terminology https://e

Wikipedia has a nice glossary of terms used in music theory and lots of linked articles: https://en.wikipedia.org/wiki/Glossary_of_musical_terminology https://en.wikipedia.org/wiki/Glossary_of_musical_terminolog... You can find a lot of recordings on YouTube and, in twenty or so years, all of them on http://allofbach.com http://allofbach.com If you can read sheet music at least on a basic level, there's a huge repository on IMSLP: http://imslp.org/wiki/List_of_works_by_Johann_Sebastian_Bach http://imslp.org/wiki/List_of_works_by_Johann_Sebastian_Bach Also, if the piece is particularly significant, it's likely that there'll be a Wikipedia article about with some more detail. There may be some books dedicated solely to the work of Bach, but I don't think they're necessary for this purpose.