| Jonny spielt auf | |
|---|---|
| Opera by Ernst Krenek | |
 Title page of the 1926 vocal score (1st edition) | |
| Translation | Jonny Strikes Up |
| Librettist | Krenek |
| Language | German |
| Premiere | 10 February 1927 |
Jonny spielt auf (Jonny Strikes Up), Op. 45, is a German-language Zeitoper with words and music by Austrian composer Ernst Krenek about a jazz violinist. He dedicated the opera to his second wife, Berta Herrmann.[1] A performance lasts about two hours. The work typified the cultural freedom of the 'golden era' of the Weimar Republic.