Bob Taylor wrote in 191229 MMDigest:

> This roll is Archer Gibson's interpretation of Lohengrin,
> Bridal Procession to the Cathedral (Wagner).

The piece is known by many names: Lohengrin, Act II Scene 4 opening;
Bridal Procession to the Cathedral; Elsa's Procession to the Cathedral;
Elsas brautzug zum Münster; Zug zum Münster; Procession to the Minster;
Minster March

> I suspect that there are missing stop changes in the roll or that
> the manuals are reversed.  By that I mean that the perforations in
> the roll become flip-flopped, between the upper and lower.

It seems like the player roll, or the perforator master roll, folded
over and shifted over a portion of the roll by one perforator channel.
This would cause the upper and lower rows of holes to swap functions.

A _really_ long perforation is a likely place to find the paper
folded over.  Listen to the performance and locate the key change from
E-natural back to E-flat, which occurs at about 53% elapsed time.  In
the performances below (Ref. 1 & 2) this happens at about time 3:11,
when a pedal E-flat is sustained for 23 seconds; at Tempo 60 this is
at least 27 inches of paper!

Sheet music for Ref. 2. may be downloaded at Ref. 3.

Robbie Rhodes
Etiwanda, California

References:

1. Elsa's Procession to the Cathedral, from Lohengrin --
"The President's Own" U.S. Marine Band
https://www.youtube.com/watch?v=e5ZW-oZ_Yjg 

2. Wagner Elsa's Procession to the Cathedral -- Justin Maxey, organ
https://www.youtube.com/watch?v=RvGUSRTtd_0 

3. "Minster March from Lohengrin", in folio "Organ Repertoire",
pages 70-73, compiled by Preston Ware Orem (C) 1909 by Theo. Presser Co.
https://urresearch.rochester.edu/fileDownloadForInstitutionalItem.action?itemId=22642&itemFileId=72041