Click one of the songs and you'll see the search results for that song's name. The top result is a music video from YouTube, which has a huge thumbnail. The video doesn't play inline, the thumbnail only links to a regular YouTube page.
You'll see the same interface if you search for a music artist and click one of the songs from the Knowledge Graph sidebar. You can also append "albums" to the query, click one of the albums and you'll see a list of all the songs from the album. Search for [Moby Wait for me songs] and you'll find a list of the songs from Moby's Wait for Me album.
It would be nice to play songs from the Google search results page. Even a short Google Play preview would be pretty useful. If that's not possible, then Google could embed YouTube's player, so you can watch music videos without opening a new page. Another improvement would be to automatically generate a YouTube playlist from all the music videos listed in the carousel, like YouTube does.
{ via Search Engine Roundtable }