Get Happy is the maimai debut of Jimmy Weckl (Harumi Ueko), a composer and guitarist who spent years contributing to KONAMI's BEMANI series, beatmania IIDX, pop'n music, GuitarFreaks, and DrumMania, before departing in 2012. His first commission outside that ecosystem was this original instrumental piece for maimai GreeN, which launched with the song on July 11, 2013. The track is an upbeat instrumental fusion number built on a synthesizer foundation, with crisp brass accents and a middle section driven by slap-style bass and cutting funk guitar. A brief female chorus at the intro lends a moody, adult-contemporary feel before the main groove takes hold. Weckl has described composing the song after visiting an arcade and watching players move to the rhythm, aiming for a danceable feel that would complement maimai's gameplay naturally. He structured the piece with an emotional arc: the first half conveys a slightly melancholic mood of happiness not yet attained, while the second half shifts into a buoyant, celebratory energy that embodies the title's exhortation. The MASTER chart (level 13+, constant 13.8, 680 notes) was originally credited under the playful pseudonym "合作だよ", literally "It's a collaboration!", before being reassigned to the design duo ニャインとはっぴー (Nyain and Happy) from PRiSM onward. The EXPERT chart is designed by 譜面-100号, a charter known for their distinctive numerical pseudonym. Over the game's lifecycle, the song's difficulty ratings have been adjusted multiple times across versions, reflecting the evolving standards of maimai's chart ecosystem.