Hephaestus Books represents a new publishing paradigm, allowing disparate content sources to be curated into cohesive, relevant, and informative books. To date, this content has been curated from Wikipedia articles and images under Creative Commons licensing, although as Hephaestus Books continues to increase in scope and dimension, more licensed and public domain content is being added. We believe books such as this represent a new and exciting lexicon in the sharing of human knowledge. This particular book is a collaboration focused on Online music stores.More info: An online music store is an online business which sells audio files, usually music, on a per-song and/or subscription basis. It may be differentiated from music streaming services in that the music store offers the actual music file, while streaming services offer partial or full listening without actually owning the source file. However, music stores generally offer partial streaming previews, some even with full length.