OK I was a teenager in the 80s so a lot of my music purchases back then were going to the record store, looking at the front and back album cover and the song titles and pulling the trigger. If everything looked metal I would buy it. There was a late night metal show on local radio on the weekend but they would only play the popular stuff like Metallica and Megadeth. Some of the albums I bought were recommendations in metal magazines.

These days I've discovered a lot of music old and new by watching the Sea Of Tranquility YouTube channel. It's all talk he doesn't play any samples on his show. Every Wednesday he posts new album reviews.

Also I follow pages on Facebook that post updates on new rock and metal releases or talk about old releases on their anniversary release date. Sometimes I'll buy a CD based on positive comments that are posted if it's a style of music I like.

If I'm really feeling nutty, I'll go to music map and find an artist that is similar to one I like. Then I'll go to Wikipedia to determine which album might be a good entry point.

I get Apple Music for free but I don't even use it. They don't have certain artists and they don't even have complete discographies for some artists. Plus I enjoy building my music library at my own pace and Plexamp is an awesome app.