A re-recording is a recording produced following a new performance of a work of music. This is most commonly, but not exclusively, by a popular artist or group. It differs from a reissue, which involves a second or subsequent release of a previously-recorded piece of music. Re-recordings are often produced decades after the original recordings were released, usually under contract terms more favorable to the artists. This is especially common among acts who originally agreed to contracts that would be considered unfair and exploitative today. When re-recordings are issued under newer contracts, artists can collect far higher royalties for use in films, commercials, and movie trailers. Other acts re-record their work for artistic reasons. Jeff Lynne of the Electric Light Orchestra released a solo best-of album with new versions of previous hits like "Mr. Blue Sky", the original of which Lynne described as "[not] quite how I meant it". Some artists, such as Def Leppard and Taylor Swift, re-recorded their music because of disputes with their labels. Re-recordings commonly appear in online music stores and streaming services, such as the iTunes Store and Spotify. Recording contracts are a way in which the ownership of sound recordings can be legally recognised. Recording contracts are often between an artist and a record label and stipulate terms relating to royalties, performance rights and recording costs. The motivation behind the re-recording of music is often associated with the legal ownership of the music and how that ownership can bring financial gains to an artist, especially if initial contract terms are financially unfavourable. Different types of recording contracts exist, and a newer model that focuses on paying the artist a prolonged salary for limited ownership of their music is becoming favourable with high profile artists such as Madonna. This new model is often seen as fairer to artists, especially financially. The internet has also given artists more power in negotiating fairer recording contracts, or even self-publishing music directly onto streaming platforms.