The Chainheart Machine is the second studio album by the Swedish melodic death metal band Soilwork. It is the first Soilwork release to feature guitarist Ola Frenning and drummer Henry Ranta. There is an instrumental hidden track on "Room No 99" as the song ends at 5:00 followed by silence until the 7:00 minute mark where the hidden track begins. The hidden track transitions perfectly into the opening title track.