When it comes to symphonic metal bands, the guitar parts aren’t usually very complex.
I know two bands which have both symphonic instruments and very technical guitars:
- Symphony X
Failed to find any more. Do you know any?
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You may want to check Edu Falaschi (ex-Angra) project called Almah. Their second album, Fragile Equality, has frequent parts of symphonic/orchestration keyboards with complex guitars riffs and progressive parts.
I also recommend you to check the Swedish Operatic Metal band Therion, most of their albums have complex orchestrations parts mixed with Power/Melodic Metal.
A very good way to find new bands is searching on related bands from your favourite artists on Last.fm. Or even searching on YouTube for "symphonic progressive metal bands megamix", will return a plenty of good suggestions!
I'd suggest Haggard as a full symphonic band, with "Eppur si muove".
Septicflesh are using a lot of orchestra parts, you can try Titan, Communion and The Great Mass.
Dark Lunacy had a violin in Forget me Not and Devoid.
Fleshgod Apocalypse uses piano and various orchestration parts, I'd suggest listening to their Agony album.
Probably less symphonic than previous bands you can give a chance to old Novembre albums: Arte Novecento, Classica and Novembrine Waltz. Their composition is unique, grasps a wide range of sounds, you'd probably like it.
When it comes to technical guitars one should definitely mention Rhapsody(now renamed to Rhapsody of Fire). Give
Gargoyles, Angels Of Darkness a try. In their older albums Luca Turilli was playing the guitars and he is very talented guitar player. The band split in 2011 and now there are two bands - Rhapsody of Fire and Luca Turilli's Rhapsody.
You may also give Gwyllion a try (e.g.
The Night Awakes).
It is worth to also mention Morten Veland - some of the peaces of Sirenia and his band Mortemia could also fit in what I imagine as technical guitars.
As for Nightwish I really like the band and I think some peaces(from the older era) could fit as well - for instance give their interpretation of
Crimson Tide And Deep Blue Sea a try.
Of course we can not leave out Therion and Haggard, but they have already been mentioned.
I think you should check the one-man-band (from Behold the Arctopus) project Direwolf: http://www.metal-archives.com/bands/Direwolf/91376
Fist in Fetus are also technical and symphonic.
Therion, Nightwish, are symphonic, not so technical. Same thing with Haggard, Septic Flesh and Fleshgod Apocalypse, they are trully symphonic and progressive, but I wouldn't call them technical. Dream Theater, Pain of Salvation, Dark Lunacy and Novembre don't fit the "Symphonic&Technical" combo either...
I would also add:
Also David Maxim Micic's solo albums have a symphonic vibe in them although he does not belong in that genre.