Need help with blue "free music" app..

I recently added this free music app that was offered to me, from some unknown source. But noticed it was an easy and resourceful app. Well after creating an awesome playlist, i noticed my voicemails from my texting app were also on there without me adding them! :( I have tried EVERYTHING in eyesight, long pressing the vm in hope of it offering a delete option but with no luck at all to deleting the unnessesary files! I tried googling "how to delete files from "free music" app and browsed app info.and see no way of deleting info or contacting app owner. Do you have ANY suggestions or can you assist me with deleting voicemails from music playlists? I have a kyocera hydro life, if that helps in any way..lol. I appreciate you time and considerations towards my frustrating issue. Thank you for your time and have a wonderful day.
Sincerely,
Amy H.

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