Uh, actually for the Giadiantuar's Revenge, the lawn was from PvZ: Journey to the West, a Chinese PvZ1 game and in it, this lawn was used for 1 chapter and has a boss called Skeleton Demon. Yeah, some fun facts about that lawn there for you
ice level music is called FREEZ'OMBIED - ICE LEVEL (REV. 2) - PLANTS VS. ZOMBIES (FANTRACK) and is composed by 🎩 | CottonEagler Seaing stars music is called Plants Vs. Zombies OST - Brainstorm (Unused) and is composed by Mr. Johnson Speckles zombies vs zombies music is called Plants Vs. Zombies OST - Brain Drain (Swamp Level, Night) (Unused) and is composed by тëмыч (tyomich) the lawn in gladiatuar's revenge is from journey to the west or social edition im pretty sure, music is original to the mod as far as i know
About music: all of it except Night Roof (Moon) theme and Giga-Gladiantuar`s boss theme was made by different people. Samen just take this music and adds into this mod. P.S. In new version of mod, there are 10 new Vasebreaker levels, 5 new I, Zombie levels and 1 new zombie.
0:29 It isn't composed by the mod team, but by someone else. Look up "FREEZ'OMBIED - ICE LEVEL (REV. 2) - PLANTS VS. ZOMBIES (FANTRACK)". You can also see this track used in Samen's promotional video for the mod. Same with 11:59, look up "Plants Vs. Zombies OST - Brain Drain (Swamp Level, Night)" 15:07 I recall Samen making a video about the (proto-version of) this minigame from the PvZ Expansion mod, where he wrote a Script trying to make the hypnotized Gargantuars function properly, but there was still the imp throw betray. The error has made it way into this mod too, it appears.