Apple One with iTunes Match

We are considering Apple One with Music +, but we have stayed away from Music + because we have hundreds of CDs, some of which are definitely not in Apple's music library (e.g. purchased from street performances or students at university performances). We have been using iTunes Match for many years. What happens to our iTunes Match and personal library when we join Apple One? What happens if we later decide to discontinue that? Do we lose our personal music library?