Looks like nohup, screen, or tmux are good options.

I've used screen before, it worked well. Though I've never used it to download stuff, it should work the same

I used screen. Just start a screen session for it like "music-downloads" and then you can quit the session and exit out OR install a DE like XFCE on your server and then use something like xfreerdp to remote desktop in, run the script in a terminal on the server, then just close your xfreerdp.

I first used screen to download everything but then decided to install XFCE and Nicotine+ and just leave it up so people can download from my library also.

this was the script I used to download my youtube playlist, you can modify it to do spotify also:

#!/bin/bash  

PLAYLIST_URL="$1"  

if [ -z "$PLAYLIST_URL" ]; then  
    echo "Usage: $0 <youtube_playlist_url>"  
    exit 1  
fi  

# Log file with timestamp  
LOG_FILE="$HOME/music-downloads/download_$(date +%Y%m%d_%H%M%S).log"  

echo "Starting download at $(date)" | tee "$LOG_FILE"  
echo "Playlist: $PLAYLIST_URL" | tee -a "$LOG_FILE"  
echo "----------------------------------------" | tee -a "$LOG_FILE"  

# Run sldl with YouTube playlist  
sldl "$PLAYLIST_URL" --yt-dlp 2>&1 | tee -a "$LOG_FILE"  

echo "----------------------------------------" | tee -a "$LOG_FILE"  
echo "Download completed at $(date)" | tee -a "$LOG_FILE"  

I just ran this in a screen session. You don't have to log everything but I did it so I could check to see what songs weren't on soulseek from my playlist.

Look at the documentation on the Github-page. It looks difficult but you only need a few options and they give you examples as well.

the tags are really decent, like the previous poster said it's pretty much all audiophiles so everything is tagged, a lot of FLAC stuff but you can sort by MP3 (Nicotine+ makes it really easy in that regard)

The great thing about it and because the user base is mostly audiojunkies is that you can find some REALLY obscure stuff. Like things you'd never find on spotify or youtube music or any of that. I once found a set from a band I love from a show I was actually at.