Hellow2 wrote:
Could it also be: "X Y Metal", like "progressive death metal"?
This taps into another convention when it comes to genre labels, especially in heavy metal; it could best be described as genre labels having "root" genres and "descriptors."
A "root" genre acts like a proper noun on its own; think "Black Metal", "Death Metal", "Progressive Metal" and so on. A "descriptor" acts like an adjective to that noun, describing a variant of it; think "Progressive", "Melodic", "Atmospheric", "Experimental", and so on. Descriptors can sometimes have the same name as a root genre, but they are not necessarily the same. The "root" genre is always the sound the music is based on, while the "descriptor" further describes how that sound is conveyed. For instance, "Blackened Death Metal" would be death metal with black metal elements to it. It's different from "Black/Death Metal" because it's not a mix of those genres, in the former's case it's still predominantly death metal.
The syntax I provided in my earlier post (ie. X Metal, Y Metal, etc.) combines descriptors (if there are any) and root genres. So "X Metal" could be "Progressive Death Metal" in that syntax.
You may see such genre labels as "Progressive/Death Metal." Like with the "Black/Death Metal" example above, when you have the / it means you have a mix of genres; neither the 'Progressive' or the 'Black' are descriptors in this case; they're treated as root genres that just so happen to be mixed with other root genres. It's just that the label has been truncated from "Progressive Metal/Death Metal" to "Progressive/Death Metal."
I suppose while we're on the topic of genre labels, there is one other thing you may run across, though it's rare, which is when the genre is "X Metal with Y influences." An example would be "Black Metal with Jazz influences" or "Power Metal with Folk influences." That doesn't mean the music is a mix of black metal and jazz, or power metal and folk music, but that you have black metal that might be trying to be a little bit jazzy, or power metal that's just a tad folky. It's clear that the influence is there, but it's not enough that you'd call the music a mix of those styles.
Hellow2 wrote:
Also I assume the same applys for "genre of Jazz" or for "genre of Rock" etc..
Could other Genre in this Case also get truncated while using "/"?
Generally, yeah, you can apply the same rules to non-metal genres. For example, "Hard Rock", "Free Jazz", etc. Likewise, if there's multiple non-metal genres that can be truncated, you can do so. For example, "Crust Punk/Hardcore Punk" can be truncated to "Crust/Hardcore Punk", or "Alternative Rock/Hard Rock" can be truncated to "Alternative/Hard Rock."
Hellow2 wrote:
And where do I know from if its "X Y <trunkated Metal>" or "X <other genre>"
Much of it just comes from recognizing the genres, honestly. If there's a / in the genre tag, and only one use of "Metal" at the end, you can assume it's truncated.