Bettertouchtool Spotify Touch Bar

if application "Spotify" is running then
    tell application "Spotify"
        if player state is playing then
            set naam to get name of current track
            set naam to text 1 thru ((offset of "-" in naam) - 1) of naam
            return (get artist of current track) & " - " & (naam)
        else
            return ""
        end if
    end tell
end if
return ""