In this case it is probably easier to just have an extra field in each table. Then just store a boolean value in the field; 0 being not approved (false), 1 being approved (true).

Otherwise, say for example you created another table and only approve so many songs per album, you would have a row for every approved/not approved song (sure, you could use a delimiter, but too much work). Overall, that would just be too much repeated data IMO.