I tried using the search first but couldn't find much, so I hope this is the right forum for this.

I've been reading a few books on music theory and I think thats helping me overall get a better understanding to write music, but not necessarily the type of music I want to be playing. My question to you UG, is would DVD's or books like some found on Rock House Method be beneficial to my metal songwriting? I listen to stuff like Children of Bodom and Chimaira so instructional DVDs they made themselves would make sense. I just want to be sure that by buying them I'd be doing myself a favor and not wasting money.