[Balloonmeister]

It's been awhile since I purchased music on iTunes and then moved from my library to an Apple device, eg. an iPod or my iPhone. Mrs. Balloonmeister wanted to add some songs to her iPod so I went into the now called Apple Music app on my Mac Mini and could find the songs she wanted but no way to purchase the individual song, ie, the little box to the right of the song which had a purchase price and a box to click for purchasing were no longer there. This was for several different artists.
I called Apple support (sure is nice to have someone in the US answer the phone) and the tech told me that one now has to subscribe to the Apple Music (AM) program (first three months free, then $9.99/month) in order to be able to purchase music for your individual library. Frankly, I found that answer somewhat astonishing as I would think that the music artists would be totally pissed that Apple was forcing people to subscribe to AM before they could purchase a song or maybe Apple is sharing part of the subscription service payments with the artists which I asked about and the tech claimed to not know, though I highly doubt. So my questions are:
1. Is the above explanation from the Apple tech even correct, ie, the only way I can purchase a song is to subscribe to AM program?
2. I am a long time subscriber to Sirius XM (SXM) and have it in nearly every car I own because a) I like the fact that it is GPS based and will work basically anywhere I am driving, and in the SW USA there are spots where there still is no Verizon cell service (and VZW is probably the best there is out here) and b) I like the 'stations' on SXM as they seem to do a good job of finding the kind of music I like in a few different genres but c) I don't like the hassle every year of finding the best price on SXM and I have to threaten them with stopping the service until I get the price I want and have to do that for each car that I have SXM in, currently four cars. AM may be the way to go if the 'stations' seem to be as good as SXM and the fact that I can stream from my iPhone to the head units in each car would mean that only one AM subscription is necessary instead of four SXM subscriptions. However, AM is based on cell reception and there may be times when I am driving that I am out of cell range and then lose AM services (and BTW, Apple Maps, which is a total PITA). Thoughts on this 'first world' issue?
3. Mrs. B'meister said that she could go into her AM app on her iPhone and purchase the song there but I wondered if I were to do that on my iPhone, would AM also put that song in my AM library so that I could move the song to my Apple devices also or would it just reside on the Mrs.' iPhone? We both use the Apple iCloud services. If I could purchase the song on my iPhone and have it moved to my AM library I could then move it to each of our Apple devices - does that method work?
Thanx in advance for any help here.