What was the first album you purchased that introduced you to the wonderful world of metal? Mine was Meshuggah's "Catch Thirty-Three". A brutal introduction for a n00b like me, it even almost turned me off to the genre because of its amelodic, destructive sound, but it grew on me and desensitized me to heaviness, thus leading me into other metal like System of a Down and Avenged Sevenfold.