Both SoundCloud and Spotify declined to comment.
Music-streaming companies have struggled to turn a profit amid competition from larger players such as Apple.
Amazon.com is also preparing to launch a standalone music-streaming subscription service.
Spotify arrives in Japan
In related news, Spotify announced today at a press event in Tokyo that the service has launched on an invite-only basis in Japan, on mobile, tablet, desktop and PlayStation consoles.
Spotify is the first music streaming service in Japan to offer both a free-to-the-user ad-supported music service and a fully featured ad-free subscription service. Users can listen for free, or alternatively upgrade to Spotify Premium for only 980 yen a month.
Beginning today, Spotify will initially be available in Japan on an invite-only basis before opening to all users.