You could have downloaded SoundMate 4.0 for Mac from our application library for free. SoundMate for Mac lies within Audio & Video Tools, more precisely Players. The actual developer of this software for Mac is icyarrow.com.
From the developer:
SoundMate is a SoundCloud player that puts you in control. You can control SoundCloud from the menu bar or attach the app to menu bar. By means of global hotkeys you can easily toggle play/pause and switch to the next or previous track even when the app is running in the background.
You may want to check out more software for Mac, such as ByteController, I Love Stars or NowPlaying for Mac, which might be related to SoundMate.