Had problems – DJ Mix Review

I open the app, trying out the stuff on it. I try to add a song. My phone sort of freezes, then when I exit out of the songs, it doesn't even add the song. This happened in both. I pressed the 'add song' button so many times and it doesn't add the song!!! Please fix this, then I would rate it 4 stars (maybe)
Review by ?Volcanic? on DJ Mix.