[11] Youngblood was the main composer of Kamelot's music from 1994 to 1998, collaborating with singer Roy Khan from 1998 to 2010.

The new composing/writing team of the band consists of Thomas Youngblood, Oliver Palotai (keyboards), Sascha Paeth (producer) and Tommy Karevik (vocals).

Youngblood collaborated with Mark Vanderbilt (ex-Kamelot vocalist) in the late 1990s for a project called "Monarque".

[23] In 2003, Youngblood was invited to play guitars on the metal opera Days of Rising Doom by supergroup Aina, a project of Amanda Sommerville, Sascha Paeth, Robert Hunecke-Rizzo and Michael Rodenberg.

They recorded the song "Flight of Icarus" for the Iron Maiden tribute double album Slave to the Power.

[26] The voice of their daughter, Annelise, appears in "Soul Society" (The Black Halo)[27] and the nursery rhyme of "Sacrimony" (Silverthorn).

[28] The voice of their son Thomas can be heard as the chorus in "Burns to Embrace" (The Shadow Theory) [29] His inspirations are varied and range from metal to new age.