Why isn't my music playing after transferring from internal storage to the sd card?

[Android Central Question]

Yesterday I transferred music from my internal storage to a folder called "music" in the sd card area and now my music isn't playing. I've tried to transfer it back but the songs have a (1) next to them now. I'm using Rocket Player and it's saying playback error. I haven't deleted anything so I don't know why it's not working. I only did it to create space. I've tried other players and nothing is working. Please help, I don't want to have to get all this music over

 

[ManiacJoe]

Which phone?
Which version of android?
Which carrier?
Which app did you use to transfer the files?
Did you do a MOVE or a COPY and DELETE?

 

[PrettyGirlChaz]

Which phone?
Which version of android?
Which carrier?
Which app did you use to transfer the files?
Did you do a MOVE or a COPY and DELETE?

The version is 7.0
LG Aristo for metro pcs. I used the file manager on the phone and I moved the music from internal to sd card but nothing is working.