Free music download for iphone 4s?

I can't remember what its called but I had this app that let me download 15 songs without having to pay but i accidentally deleted it and I can't for the life of me find it again. All I know is it downloaded the songs off of youtube and put them on the app so i could listen to them without using data and it had a logo that was a white square with a blue star in the middle. Please and thank you.

I'm not sure which app your talking about but you could try ITube. It's free & will let you download songs/videos from YouTube for free! You just get the app then…
1. Search whatever music
2.once you click on the video, there will be a plus sign on the top right hand corner.
3.click on it & create a name for your playlist
4. Add it there
5. & your done. You can add all the music you want for free just keep repeating to push the + button & add it to your playlist.
Hope you like the app.