Definitely needing lyrics
I have to say, this wasn't bad. This song needs lyrics. The guitar was a bit repetitive at times.
If I had to suggest a type of voice for this, I'd probably go with maybe an Ian Gillian. The whole song gave off a very Deep Purple-ish vibe. This, though, was one of this songs failing points. It could have explored this very classicist heavy metal connection, but instead it went for a very base average heavy metal song.
Give it some lyrics, a singer, and play up the classic rock and roll, and I'd be more than happy to give you a 10/10.
Hope I was helpful. Peace!
Nice work, the harmony is really tasty but it needs some lyrics to be really perfect...mabye some scream or some woman voice....Altough...good job man!