You can download or view standard "Happy Birthday" lead sheets from these repositories to use as a base:
While there is no specific "official" sheet music released by the Bulgarian group for their version of "Chestita Rozhden Den" (Happy Birthday), you can use standard "Happy Birthday" arrangements and adapt them to their folk/pop-folk style. Musical Structure for Ork. Char’s Style You can download or view standard "Happy Birthday"
: Offers multiple variations, including jazz and classical arrangements that can be adapted for an orchestra. Instead of a simple waltz, use a steady
Instead of a simple waltz, use a steady 3/4 "Sa-sa" or "Kyuchek" beat on drums or a keyboard rhythm track. Melody Notes (C Major) : Includes basic melody
Bulgarian "orkestar" versions often add trills (mordents) to the melody and a short instrumental "soli" section between verses. How to Play Happy Birthday on Piano
: Provides free downloads for guitar chords and lyrics. Melody Notes (C Major)
: Includes basic melody and chords in F Major.