Dan,
as an aside, I happen to share Harald's feelings towards yodeling songs but I wouldn't have posted if that was all I wanted to tell.
Go here for Auf Wiederseh'n including a midi.
Auf der Reeperbahn nachts um halb eins was on that site too until a threat with legal action came. If you can read German and are interested what can happen if you post lyrics somebody still has the rights for click and read.
However, that threatening company has not found yet this place that also has a midi of 'Auf der Reeperbahn'. I think, I'd better not post that song but would like to add that in verse 3 a line is missing: After line 3 you have to add the line 'auf der Reeperbahn nachts um halb eins'.

Wolfgang