I'd be more of a fan of Depche Mode than I would be of Opeth
As I remember it in Australia in the late 70's and early 80's before music was so easy to get, radio stations here played a lot of British/Euro pop and a lot of that was synth/electronic driven, where as the music the same stations were playing from America was more of a pop-rock feel. To be honest I didn't care a lot for genres and labels back then and many of the bands I thought were one genre might have been in another. I didn't really care, still don't to a large degree, where music comes from, if I like it, I like it, if I don't, I don't. So while I've heard quite a bit of the music, can probably even recognise a lot of bigger songs from the opening bars, it's not something I spend time listening to just for the sake of listening to music.
On the thought of influences:
When it comes to bands who influence those who I listen too I don't think much about it. I read from time to time which bands influence which artists but I rarely go off and seek a song or band just because someone I'm listening to got influence from it. Not suggesting there is anything wrong with people who do but I just don't tend to do it. To me taking such a trip would just see me come full circle to what I already listen too. (bear with me
). Opeth were influenced by Depche Mode, DM were early influenced by the Cure, The Cure were influence by Bowie, Bowie was influenced by Little Richard. I'm already back to the rock n roll I grew up listening too.
Simplistic and pointless and I could do it with pretty much any band. It doesn't take anything away from bands like DM or others that did influence some metal artists but doesn't make me want to listen to a band just because of who they influenced.
Based on my original list of Aussie bands I could say Rose Tattoo influenced GNR and Skyhooks influenced Maiden enough for Maiden to do a cover of one of their songs. But I don't listen to the Tatts or Skyhooks because of who they influenced I listen to them because they make great music and I like it.