Soulseek is a peer-to-peer (P2P) network and application. The term Soulseek might refer to (1) one of the two networks, or (2) one of the three official user client interfaces. Soulseek is used mostly to exchange music, although users are able to share a variety of files. Soulseek was created by Nir Arbel, an Israeli programmer from Safed. Historically, there have been two independent networks under the Soulseek name, both run by the same management. The older one is accessed by Soulseek client 156; the newer network accessed by Soulseek client 157 (Windows only) or SoulseekQt (Microsoft Windows, macOS, or Linux platforms). The network accessed by client 156 has since been shut down, as usage had dropped nearly to zero. New developments are solely on the SoulseekQt client interface. Work on Client 157 (Windows only) stopped in 2008. SoulseekQt has somewhat different functionality compared to the 157 client interface. As a peer to peer (P2P) file sharing program, the accessible content is determined by the users of the Soulseek client, and what files they choose to share. The network has historically had a diverse mix of music, including underground and independent artists, unreleased music, such as demos and mixtapes, bootlegs, live tracks, and live DJ sets, but releases from major and independent labels can also be found. Soulseek depends on a pair of central servers. One server supports the original client and network Version 156, with the other supporting the newer network (functioning with clients 157 and Qt). While these central servers are key to coordinating searches and hosting chat rooms, they do not actually play a part in the transfer of files between users, which takes place directly between the users concerned. (See Single Source Downloads below). Users can search for items; the results returned being a list of files whose names match the search term used. Searches may be explicit or may use wildcards/patterns or terms to be excluded.