A work prepared by two or more authors with the intention that each contribution will merge into one inseparable whole. If one songwriter writes all of the music to a joint work and another songwriter writes all of the lyrics to the joint work, each songwriter will own 50% of both the music and lyrics.

What Should You Look For In A Good Mastering Engineer?
If you’re in the music biz, then you need good mastering before you launch your records. But, what should you look for in a good mastering engineer?