Decipher is the second album by Dutch symphonic metal band After Forever, released on 27 December 2001. In this album, the band make use of live classical instruments and a complete choir to back up the soprano voice of lead singer Floor Jansen. Thrown in the mix are also a duet of soprano and tenor voices in "Imperfect Tenses" and the recording of the late Israeli PM Yizhak Rabin's voice during the 1994 Israel–Jordan peace treaty signing ceremony in "Forlorn Hope". This is the last After Forever album with guitarist and founder Mark Jansen, who left the band soon after its release.

Symphonic metal is a cross-generic style designation for the symphonic subsets of heavy metal music subgenres. It is used to denote any metal band that makes use of symphonic or orchestral elements. The style features the heavy drums and guitars of metal with different elements of orchestral classical music, such as symphonic instruments, choirs and sometimes a full orchestra, or just keyboard orchestration.