Mustan Sydämen Rovio (Pyre of the Black Heart) is the debut solo album by Finnish singer and bassist Marko Hietala of Nightwish and Tarot fame, released on 24 May 2019[4] via Nuclear Blast.

Mustan Sydämen Rovio spent 2.5 years in the making, with work on it commencing when Nightwish took a break in 2016.

[7][8][1][9] Nightwish's then session drummer Kai Hahto was initially considered for the album, but he got himself injured while renovating his house and was replaced by Hietala's old friend Anssi Nykänen.

[5] Mustan Sydämen Rovio was re-released in English under the title Pyre of the Black Heart on 24 January 2020,[14] also via Nuclear Blast.

[14] Writing for Kerrang!, Steve Beebee rated Pyre of the Black Heart 4/5 and said it mostly "gives insight into what Marko's capable of when given a free run.