The closest thing I can find is a submenu on the support site that asks for support about listening to music on Google Play on the web:
I've contacted Google Support using this link, and if they share anything with me that is helpful, I'll share it here.
EDIT: I received a reply from customer support:
Thank you for contacting Google Play Support, I see you have concerns
regarding content being incorrectly matched with similar named bands.
I understand how upsetting this must be. I assure you I will do my
best to assist you today. Thanks for taking the time to report this
issue with Google Play's music content. This information will be
passed along to our content quality team, who will make any necessary
corrections. Please note that this may take some time, since we must
communicate with music labels to correct the content. We appreciate
Apparently, there is a content quality team, and they do want this information, even if it difficult to communicate with them. As of this writing (June 24, 2013), the aforementioned problems for Tété and Reilly still exist in the search results.