Which is Best App for getting QED U-Play Stream to access music on iMac

Hi, hopefully someone out there also has a QED U Play Stream. Mine, is working fine in conjunction with my iPad, no complaints there, but I'm now looking for help from anyone who also knows of an App which would allow to get tunes from my late 2013 27" iMac running 10.10.3 (whether within iTunes or .flac files, etc, elsewhere on my HD) - and ideally without needing my iPad.

Is there such an App?

If there is but only way is by accessing my iMac via the iPad then how do I set-up the iMac "system prefs" to allow such interrogation without compromising security?

Thanks, in advance, for any help.

Simon