Here Lies Love’s pre-show is electronic music’s version of an overture.

An overture is comprised of altered excerpts from the score, compiled together to create a different whole out of musical parts originally written for a different context.

A remix is comprised of altered excerpts from the song(s), compiled together to create a different whole out of musical parts originally written for a different context.

And Here Lies Love’s pre-show is a compilation of remixes of Here Lies Love’s songs. 

It’s an overture comprised of remixes, which might be a redundant phrase, because an overture is already a remix of remixes of the score.