The following are recommendations for some niche classical musical playlists:

1. "Musical" - the official playlist of NetEase Cloud Music, which contains a large number of classical musical songs.

2. "Classical Musical" - The song list created by user "Xiaoyu'er" contains some niche classical musical songs.

3. "Niche Classical Musical" - a song list created by user "Xiao Yu'er", which contains some lesser-known classical musical songs.