Guide to the Pianist's Repertoire, Fourth Edition by 
The Pianist's Guide to Transcriptions, Arrangements, and Paraphrases by Repertoire bibliographies are lists of musical works, organized by instrumentation, time period, or other meaningful scheme. Annotations with each work often include notes on style, technical challenges, and difficulty level. They can be an excellent tool for assisting a pianist or organist with choosing repertoire.
Each link below executes a library catalog search for bibliographies with a particular subject heading related to keyboard music.