Don't forget Boolean operators (AND, OR, NOT) in your searches. These will help refine your searches. For example, "Beethoven early symphonies" will usually get information on his first three symphonies. However, if you add "NOT symphony no. 3" the search will ignore items with Symphony No. 3 mentioned.
Books / ebooks
Massenet and his letters: a new biography by Anne Massenet [Ebook]
Strauss by Laruenz Lutteken [Ebook] (This ebook is about Richard Strauss.)