Here is the lyrics file for Happy. Lots of children were persuading me to do this song, which had been a massive hit over the previous few months, although it was early days in the project so I was still writing the lyrics.
Here is the final version of the song, with the secondary school band performing.
Here is the rehearsal file for the song, exported from Sibelius. We decided to add the bridge (“Bring me down”) after I had put together this file, so it appears in the lyrics and the final version above, but not this rehearsal file. We decided to cut the high “Happy happy happy happy” bit after trying it a few times and being deafened by the cacophony!!
Mr G's musical maths 
funnnnnnnnnnnnnnnnnnnnnnnnnn!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!