For those parishes livestreaming their Masses and using copyright music, there are different laws that apply to these livestreamed Masses. You must ensure that the parish’s license for music used during in-person liturgy also covers the use of said music when live-streaming Masses online (via the parish website, Facebook, YouTube, etc.).
There are FREE music alternatives. Parishes may simply sing the Mass and not add other music. If parishes want to add songs to their Masses, there are options in the public domain, which can be found on the following two sites. Should you provide a digital worship aid, you still need to print any required copyright acknowledgement.
• http://www.icelweb.org/musicfolder/openmusic.php • Sample copyright acknowledgement: The English translation and chants of The Roman Missal © 2010, International Commission on English in the Liturgy Corporation. All rights reserved.
• https://musicasacra.com/music/ Otherwise, we advise that the parish obtain an annual license from ONE LICENSE: https://onelicense.net/options-and-prices. This license covers hundreds of publishers, including the most popular publishers such as OCP, WLP, GIA….
The above comes from an April 27 release from the Sacramento diocese.