Why can't I play SoundCloud tracks using Safari?

As SoundCloud has noted on their help site, beginning with Safari version 6.1, Apple recently made changes to the browser that interfere with the ability to stream tracks on SoundCloud.  

As a fix, SoundCloud recommends editing the Advanced options in Safari Preferences, as shown in the image below.  

Go to Safari --> Preferences --> Advanced and un-check 'Stop plugins to save power'.

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