I came up with a simple arrangement of Auld Lang Syne for hydraulophone.
The melody is pentatonic and there's 2 keys you can nicely play it in on a standard park hydraulophone as you would find in many waterparks (like Legoland in Carlsbad California, African Lion Safari in Canada, etc.), playgrounds, museum spaces (like Mayborn Museum in Texas or Chicago Children's museum, etc.), science centres, and the like.
The melody plays nicely on the interval from C to d (one octave plus one whole tone) or from D to e.
More generally, for these two options, here is the key they fall in, along with the compass (range of notes), and a list of the notes within that key that are used by the melody:
|....Compass;....||Notes required; ....||Key ....|
|....C to d ;||C,D,F,G,c,d ;||F-major|
|....D to e ;||D,E,G,a,d,e ;||G-major|
Where the two differ more substantially is in the accompanying chords.
Hydraulophone is like an underwater flute that has 12 mouthpieces, so it can play up to 12 notes at the same time! Therefore to make full use of the polyphony, let's consider the two options.
Here are the chords in the the key of F-major:
F, C, F, Bflat, F, C, Dminor, Gminor, F
and here are the chords in the key of G-major:
G, D, G, C, G, D, Eminor, Aminor, D, G.
Many hydraulophones installed in public parks/waterparks, beaches, museums, etc., don't provide end users with access to the tuning screws or valves or any adjustments of key, or the like.
Thus, in F-major we'll play the Bflat chord rootless, and we'll play the Gminor without the Bflat, i.e. as a Gsus.
In G-major we'll play the D chord as a Dsus chord (i.e. omit the F# from the chord).
It sounds better in G-major, because roots are more important to chords than the 3rd element of the chord.
And I kind of like the way the Dsus sounds.
Therefore, let's start with the key of G-major.
In the following step, I'll provide my arrangement for Auld Lang Syne in G-major for the 12-jet hydraulophone.
In the above diagram is my arrangement for Auld Lang Syne on 12-jet hydraulophone, with notes running left-to-right, and time-axis running down the page. Chords appear to the left, and lyrics are to the right, as a point-of-reference (e.g. with the lyrics that correspond to chord onset capitalized).
The KEY to good music is play, fun, and frolic, i.e. to play in the water!