# Nocturne No. 21 in C minor, Op. posth.

> composition for piano by Frédéric Chopin

**Wikidata**: [Q11431261](https://www.wikidata.org/wiki/Q11431261)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Nocturne_in_C_minor,_Op._posth._(Chopin))  
**Source**: https://4ort.xyz/entity/nocturne-no-21-in-c-minor-op-posth


## References

1. Grove Music Online
2. Library of Congress Authorities
3. MusicBrainz
4. [Source](http://www.musiqueorguequebec.ca/catal/chopin/chofopus.html)
5. [International Music Score Library Project](https://imslp.org/wiki/Nocturne_in_C_Minor,_Op.P2/8_(Chopin,_Frederic))
6. Carnegie Hall linked open data