an "optimised" sheet of "happy birthday", cursed beyond cursed. instead of playing the song linearly, it tries to utilise as many jumps as possible so it all fits on one line of five bars. really the only thing right about this is the key (F major) and the fact that if you let the computer play it it sounds like "Happy Birthday". i wouldn't even call it "technically correct" since if you ask a human to play it it'll sound off, even once they understand all the jumps. the key signature is F major (one flat), the time signature is 3/4, and there's an instruction to swing. there's no pickup, rather the first bar starts on what would be the "happy" pickup, and there's a dotted barline between the two swung 8th notes and the rest of the bar and the text "to coda" (this will be important later). the first instance of "to you" is under a first volta with a repeat sign, and the second "to you" is in a second volta, with a segno at the start of the bar and a "fine" and a "d.c. al coda" both at the end. then the bar with "birthday dear" inexplicably changes to 4/4 and is marked as coda with the name of the person stretching across barlines. finally the final bar, which ends on the last iteration of "birthday", instructs the player "D.S. al Fine". playing and following all of these ridiculous instructions results in: first bar ("happy birthday") second bar ("to you") first bar again ("happy birthday") third bar (second "to you") only the two swung 8th notes of the first bar ("happy") fourth bar ("birthday dear" and the first half of the name) fifth bar (second half of the name and "happy birthday") third bar again (final "to you").