# Helmut Köllen

> German prog bassist and songwriter (1950–1977)

**Wikidata**: [Q5709669](https://www.wikidata.org/wiki/Q5709669)  
**Wikipedia**: [English](https://en.wikipedia.org/wiki/Helmut_Köllen)  
**Source**: https://4ort.xyz/entity/helmut-k-llen


## References

1. MusicBrainz
2. Discogs