Why my music disappeared?

[AC Question]

I have the Galaxy s5 i had a 32gb sd card and i downloaded music from an app called google mp3 Downloader but had to switch to another mp3 Downloader app after that one stopped working. I ordered a 128 gb sd card for my galaxy s5 but when i transferred everything over to the new sd card from the old i noticed i dont have most if not all the songs i downloaded on the google mp3 downloader. Help please its too many songs to remember each by name

 

[B. Diddy]

Welcome to Android Central! Is this a legitimate music download site, or does it include "shared" (i.e., copied without permission) music?