If I like a song, my first tendency is to transcribe it into a notation software like Musescore. Unlike arranging, the goal of a transcription is to mimic the original song as closely as possible. Since I don't have a live orchestra at my disposal, this usually just involves getting the right instrumentation and voicing. However, I recently obtained some free orchestral instrument that I can use in Garageband, so I've shifted to using Garageband for these mockups. (the slight difference between a transcription and a mockup for me is that a mockup tries to mimic how the song sounds, while a transcription tries to mimic what the original score might have been like).

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Here are some of the songs I've worked on. You'll notice that most of them are OST's from movies, tv shows, or video games. (For some of them, I only did the section I found most interesting at the time, so they aren't always the full song)