There's no 唱歌 and no Mushu, but the new 花木兰 is closer to the original than it may first appear. Check out this side-by-side comparison of the new 花木兰 2020 trailer with the 1998 original.
An animated dramatization of the 1936 musical composition 由 Sergei Prokofiev, produced 由 Walt Disney, with Sterling Holloway providing the voice of the narrator. It was originally released theatrically in 1946 as a segment in Make Mine Music.