The nixpkgs-unstable channel's programs.sqlite was used to identify packages producing exactly one binary, and these automatically added to their package definitions wherever possible.
librosa 0.10 makes `resampy` optional, from https://librosa.org/doc/0.10.0/generated/librosa.resample.html: > samplerate and resampy are not installed with librosa. To use samplerate or resampy, they should be installed manually