Musical Union <London>
| John Ella an Louis Spohr in London | London, Sonnabend 3. Juli 1847 | 1847070313 |
| John Ella an Louis Spohr in London | London, Dienstag 28. Juni 1853(?) | 1853062813 |
| John Ella an Louis Spohr in London | London, Montag 4. Juli 1853 | 1853070413 |
| John Ella an Louis Spohr in London | London, Sonnabend 9. Juli 1853 | 1853070913 |