Honestly, I've found Youtube Music great for discovery. There's a lot of metal bands that are small enough that you can't find their album preorders on Amazon

Honestly, I've found Youtube Music great for discovery. There's a lot of metal bands that are small enough that you can't find their album preorders on Amazon that I found only by following the musical recommendations down the rabbit hole. In my city smaller bands from Europe don't tend to get a lot of playtime on the radio.