# Waltz No. 18 in E-flat major, Op. posth., "Sostenuto"

> B. 133, KK IVb/10, P 2/10

**Wikidata**: [Q11315130](https://www.wikidata.org/wiki/Q11315130)  
**Source**: https://4ort.xyz/entity/waltz-no-18-in-e-flat-major-op-posth-sostenuto-


## References

1. Grove Music Online
2. MusicBrainz
3. [Source](http://www.musiqueorguequebec.ca/catal/chopin/chofopus.html)