How to fade in and fade out music?

Hello,

I am using UE4 for a uni assignment. Though, I am very very very new.

I added music to my level but how do I fade out music 1 and then introduce music 2 then music 2 would fade out.

For example

Level plays > Music 1 plays for 15 seconds > Music 1 fades out > Music 2 plays for 15 seconds > Music 2 fades out

Thanks