downloads song as youtube_id.wav runs spleeter and downloads separated audio as output/youtube_id/vocals.wav output/youtube_id/accomp....wav and or demucs for source separation (uncomment the one you want)
runs basic-pitch on top
create a virtual environemnt if it doens't already exist.
source "venv_name"/bin/activate
pip install -r requiremetn.txt
python3 dl_sep_run.py "youtube_link"