The JtRH tracks definitely weren't included in 3.x and 4.x. In fact, Stefan made
a tool so people could extract the music from 2.x and use it in later versions. My understanding of the situation, which I'm sure is incomplete, is that Emmett Plant was hired to write music for JtRH and even posted
some samples on the forum, but ultimately had to back out and only completed the title screen track, so Erik
decided to polish up some of his own music and use that instead. Jon Sonnenberg was hired to provide new music for TCB, but I'm not sure why Erik's music was removed.