SoundCloud has linked up with Third & Hayden, the Atlanta management and services company founded by music exec Kei Henderson, for a joint venture, the companies announced today (Dec. 5). The new venture will see Third & Hayden signing new acts to its label and developing them with the help of SoundCloud’s services division, which will provide marketing, A&R, distribution and promotion support, as well as financial backing. The first two acts to sign to the new venture are Los Angeles singer/songwriter Jordan Hawkins and Atlanta-based rapper Key!. The deal is the latest for SoundCloud’s new roster initiative, which has previously inked a joint venture with Quality Control’s Solid Foundation Management to work on new acts and signed distribution deals with Lil Pump, Tekno and Al...