I just checked and yes, search inside of books with previews is still possible.
(a) when you search books.google.com and find a book with a preview, it opens their new book viewer - the search is at the bottom of the page. You can also click "View All" to see all references of your search in that book.
(b) if you go to the book homepage (clicking X in the top right of the book viewer if that opened), there's still a "Search Inside Book" next to the "Preview" button under the title.
I continue to reach out to at least one independent band or artist each year, even now in my mid-30s. Around the end of each year, I review my top artists and songs to see which truly resonated with me as part of my life's soundtrack. Whether through email, SoundCloud, Facebook, LinkedIn, or VK, I take the time to express my appreciation for their work—sharing which songs touched me and why. Amazingly, nearly every artist responds. One memorable instance was when an artist, who hadn’t produced music in over a decade and was going through a tough divorce, told me a year later that my message had inspired him to return to music and embrace life anew. Your engagement with musicians can have a profound impact, perhaps even inspiring them to rediscover their passion. Keep reaching out and sharing your love for their art—it truly makes a difference, no matter your age!
YouTube Music was really rough in the beginning, and while I still have some UI nitpicks, I've come to find its radio algorithm to be much superior than Google Music's ever was for finding enjoyably obscure tracks. The tracks I uploaded to Google Music and transferred to YouTube Music are still playable through YouTube Music and downloadable from Google Takeout. If you migrated your library to YouTube Music, you may yet be able to download them from https://takeout.google.com (YouTube and YouTube Music).
Over a year ago Google Music sent out notices that users can download or migrate their uploaded media to YouTube Music via https://music.youtube.com/transfer. There really wasn't a shortage of notices and blog posts across a wide variety of media outlets instructing people to migrate and warning when Google Music was shutting down.
I don't typically visit Wikipedia, but when I do, I read something and then try to visit the source(s) for that something. More often than not, the source URLs are dead.
Google provides paid email (which includes support) under the service of Google Apps for Work. You can call or email an actual Google tech support employee 24/7 for core services when you need help (number will be in the admin panel).
But when you're getting a product for free, especially email (Hotmail/Live Mail, Yahoo, AOL, Gmail, etc) you really can't expect any provider to provide comprehensive one-on-one support as it is rather pricey. So you're right to go to a paid plan somewhere.
(a) when you search books.google.com and find a book with a preview, it opens their new book viewer - the search is at the bottom of the page. You can also click "View All" to see all references of your search in that book.
(b) if you go to the book homepage (clicking X in the top right of the book viewer if that opened), there's still a "Search Inside Book" next to the "Preview" button under the title.