Even among the guitar tracks are various tones, string styles, amps and acoustics. There are layers here that can be heard time after time without getting tiring. The vocal tracks are shared, one each on leads and one all together. All are catchy pop tunes that radio should like. Dente's sounds kinda like Collective Soul whereas Keaggy's and King's sound like Keaggy and King, which is very good.
Invention is a great driving, reading or headphone album.
It won't change the course of rock as we know it, and it won't get any of the members into the guitar players' hall of fame. But it sounds like it was a blast to record and that fun makes the translation. It sure does leave you itching for a live show though.