如何将队列和播放与discord.py音乐机器人结合起来？

import discord
from discord.ext import commands
import youtube_dl
import ffmpeg

bot = commands.Bot(command_prefix='!')

queue = []

def play_music(ctx):
    if not queue:
        return

    voice_channel = ctx.author.voice.channel
    voice_client = discord.utils.get(bot.voice_clients, guild=ctx.guild)

    if voice_client is None:
        voice_client = await voice_channel.connect()
    else:
        await voice_client.move_to(voice_channel)

    ydl_opts = {
        'format': 'bestaudio/best',
        'postprocessors': [{
            'key': 'FFmpegExtractAudio',
            'preferredcodec': 'mp3',
            'preferredquality': '192',
        }],
    }

    with youtube_dl.YoutubeDL(ydl_opts) as ydl:
        info = ydl.extract_info(queue[0], download=False)
        url2 = info['formats'][0]['url']
        voice_client.play(discord.FFmpegPCMAudio(url2, **ffmpeg_options), after=lambda e: play_music(ctx))
        queue.pop(0)

@bot.command()
async def play(ctx, url):
    queue.append(url)
    if len(queue) == 1:
        play_music(ctx)

bot.run('YOUR_BOT_TOKEN')