The weird music you hear in First Gundam during encounters with Lalah is a stock effect called “Bizarre 6” (most likely cooked up by SFX editor Akihiko Matsuda) It can only be found in full on “サウン道 アニメ・恐竜・SF編 VOL.2”, a CD collection of anime sound effects overseen by Katsumi Itou of Swara Pro