Note that the repeat feature only works on the desktop version of the SoundCloud website. You can actually find this keyboard shortcut by pressing 'H' while you're browsing And while you did that, you'll see the entire list of keyboard shortcuts as well. This little trick does not work on embedded sounds, like the one below. Press it again to stop the track from repeating.
On the bottom player at the SoundCloud website, clicking the Repeat playing track button highlighted below, will achieve the same thing - continuous loop. You'll notice the song starts from the beginning and it will continue to loop until you press Shift+L again. Scroll to the end and let the timer run out. There is no visual confirmation that the loop has been activated, but don't worry, it's on. Repeating a track on SoundCloud is easy: just hit Shift+L while you're playing your favorite sound or song. So you got a song looping addiction and Auto Replaying a YouTube video ( also for Android) is not enough for you? We've got you covered for SoundCloud as well.