Yay! I love it when I introduce somebody to a new band that they like
Distorted Harmony is pretty cool! Their first two albums are pretty much prog rock with some light metal elements (longer songs, more elaborate structures). A bit like early Haken.
and their latest album, A Way Out (this song is from that album) is closer to prog metal with shorter tighter songs. So it depends on what sounds more exciting to you!
Opeth is on my list, but I still haven't really delved into them yet. I gotta get on that! This is great
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I'm not familiar with Erra! They remind me a bit of Periphery (how they're bouncing back and forth between clean and harsh vocals). I'm listening to Augment now (which RateYourMusic says is their best album)
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PS - There's a brief part in this song, Alpha Seed, with a harp! That was sweeeeeeet