For the xdelta, use DeltaPatcher to patch it on your data.win (make a backup before patching if you'd like!)

for the music copy the "superchargedknight" FOLDER INTO THE "mus" folder of your Deltarune install.
The resulting path to the song should be "path_to_your_DELTARUNE/mus/superchargedknight/cleaver.ogg". Mind the superchargedknight folder inside the mus folder!