Pandora - Pandora Radio is a free (ad-supported) internet radio founded in 2000.
Jamendo - Jamendo app is a free Android music player that allows you to download and listen to music legally for free on your mobile device.
Spotify - Map shows when two people play same song at same time
Songr - Windows XP/Vista/7/8, freeware, 5 MB. Portable version · Songr 2 player. Songr 1. Note: Songr does not index nor host any mp3 files, it's just a desktop interface to third party mp3 search engines.
iMazing - iMazing lets you transfer music, files, messages, apps and more from any iPhone, iPad, or iPod to a computer, Mac or PC. Manage and backup your iOS device simply without iTunes. (was DiskAid)
Plug.dj - With the world constantly at war with itself, and with barriers being put into place between people, it sometimes seems as though there is nothing that can unify the human species. Read more about Plug.dj.