You can Put any song to Ignore list and also you can later restore that particular song,
To put any song in ignore list you need to tap on drop down menu of particular song,
then you can tap on Move to Ignore list.
to restore your song you have to perform this steps
first you need to tap on drawer and then you have to tap on Ignore
there you can look all your ignore songs if you want to restore them so you can tap on drop down menu of particular song
there you will look two options restore and delete, if you want to restore so tap on restore
or if you want to delete so tap on delete