1) There are a handful of artists that trigger the music-related functions straight from the Google search bar.
Notice the special area up top above the search results with the picture, etc. This way of entering the Google music area only works for a handful of artists, currently.
2) A little bit of digging actually finds the dedicated the Google Music Search page.
This seems to work for a much larger number of artists.
3) From the music search results page, one can click through to a number of additional resources.
- The artist’s page (the Google “musica” page)
- A page for track listings for each album listed (the Google “musicl” page)
4) You can buy from online sellers who stock the item
From the listing purchase page, you can see which online sellers have the item (the Google “musiclp” page)
There appear to be a few other functions as well (e.g. “show all tracks“, the Google “musicad” page). Enjoy!