Installing MusicBot on Raspbian may take a while to complete. If you're willing to try it, you can run the following commands in order to install it:

# Update system packages
sudo apt-get update -y
sudo apt-get upgrade -y
# Install dependencies
sudo apt install python3-pip
sudo apt install git
sudo apt install libopus-dev
sudo apt install ffmpeg
# Clone the MusicBot
cd ~
git clone https://github.com/Just-Some-Bots/MusicBot.git MusicBot -b master
cd MusicBot
sudo python3 -m pip install --upgrade -r requirements.txt

After this, you'll find a MusicBot folder located in your home directory. You can configure the bot, and run it with ./run.sh from there.