All changes to tower
| Date | Change | Source |
|---|---|---|
| 6 Feb 2010 | 1-6: frame id added; frame info added | John Arthur via e-mail |
| 24 Jun 2009 | 1-6: canon info added; 1-5: nominal added; 6: nominal amended | Andrew Higson via 00007624 |
| 8 Nov 2004 | Tenor nominal supplied, so note is NOT A (nominal=Bb-29c) | Bill Hibbert via e-mail |