these tasks. The record company pays the recording artist a portion of the income from the sale of the recordings, also known as a "royalty", but this is distinct from the publishing royalties described above. This portion is similar to a percentage, but may be limited or expanded by a number of factors (such as free goods, recoupable expenses, bonuses, etc.) that are specified by the record contract. Session musicians and orchestra members (as well as a few recording artists in special markets) are under contract to provide work for hire; they are typically only paid one-time fees or regular wages for their services, rather than ongoing royalties. Media Physical media (such as CDs or vinyl records) are sold by music retailers and are owned by the consumers after they buy them. Buyers do not typically have the right to make digital copies from CDs or other media they buy, or rent or lease the CDs, because they do not own the recording on the CD, they only own the individual physical CD. A music distributor delivers crates of the packaged physical media from the manufacturer to the retailer and maintains commercial relationships with retailers and record companies. The music retailer pays the distributor, who in turn pays the record company for the recordings. The record company pays mechanical royalties to the publisher and composer via a collection society. The record company then pays royalties, if contractually obligated, to the recording artist. When music is digitally downloaded or streamed, there is no physical media other than the consumer's computer memory on his or her portable media player or laptop. For this reason, artists such as Taylor Swift, Paul McCartney, Kings of Leon, and others have called for legal changes that would deny social media the right to stream their music without paying them royalties. In the digital and online music market of the 2000s, the distributor becomes optional. Large online shops may pay the labels directly, but digital distributors do exist to provide distribution services for vendors large and small. When purchasing digital downloads or listening to music streaming, the consumer may be required to agree to record company and vendor licensing terms beyond those which are inherent in copyright; for example, some services may allow consumers to freely share the recording, but others may restrict the user to storing the music on a specific number of hard drives or