Sure. Couple of points:
* Lastfm has an API but it's not great and an API is different to a dataset. I want to have the data available in my own DB, not have to make requests for whatever I might need.
* You can't get youtube links from the lastfm API, you have to crawl the tracks pages.
* The tags on lastfm are a folksonomy not a fixed taxonomy like musicbrainz
I have used [music-map](https://www.music-map.com/) and last.fm together to make a [playlist generator](http://playlist.hallofbrightcarvings.com.au) but I'd like to be able to do the same kind of thing without having to crawl third party sites.
I'd also like to know that there was a music database of listenable music that was kept up to date.