Is Spotify included in the distribution bundle?

Yes! To see a full list of partners - https://cdbaby.com/digital-distribution-partners.aspx

If you have a distribution account set up and wish to add Spotify, head over to www.cdbaby.com and log into My Account to set up a new distribution partner.

https://support.cdbaby.com/hc/en-us/articles/203820919-What-partners-sites-will-my-submission-go-to-How-do-I-select-specific-partners-sites-