[Python] Why am I getting the error "command is not found"?

I was following this tutorial on how to create a discord music bot like Rythm using discord.py. I had troubleshooted my code and fixed a few errors to do with coroutine.

I have called the r function and now get this error upon running the code:

main.py:15: RuntimeWarning: coroutine 'r' was never awaited r()
​

When I run the code everything boots up successfully until I try to use a command. If I put '@join' in the chat it should have joined the voice chat or said "You're not in a voice channel!". Instead I get this error:

2022-09-02 20:07:08 ERROR discord.ext.commands.bot Ignoring exception in command None discord.ext.commands.errors.CommandNotFound: Command "join" is not found
​

I have tried swapping out @commands.command for @client.command (whilst also defining client in music.py) but more of the same.

I have two files, main.py and music.py.

MAIN.PY

import discord
from discord.ext import commands
import music

cogs = [music]

client = commands.Bot(command_prefix='@', intents=discord.Intents.all())


async def r():
for i in range(len(cogs)):
await cogs.setup(client)

r()

client.run(
"my token")


MUSIC.PY

import discord
from discord.ext import commands
import youtube_dl


class music(commands.Cog):
def __init__(self, client):
self.client = client

@commands.command()
async def join(self, ctx):
if ctx.author.voice is None:
await ctx.send("You're not in a voice channel!")
voice_channel = ctx.author.voice.channel
if ctx.voice_client is None:
await voice_channel.connect()
else:
await ctx.voice_client.move_to(voice_channel)

@commands.command()
async def disconnect(self, ctx):
await ctx.voice_client.disconnect()

@commands.command()
async def play(self, ctx, url):
ctx.voice_client.stop()
FFMPEG_OPTIONS = {'before_options': '-reconnect 1 -reconnect_streamed 1 -
reconnect_delay_max 5', 'options': '-vn'}
YDL_OPTIONS = {'format': "bestaudio"}
vc = ctx.voice_client

with youtube_dl.YoutubeDL(YDL_OPTIONS) as ydl:
info = ydl.extract_info(url, download=False)
url2 = info['formats'][0]['url']
source = await discord.FFmpegOpusAudio.from_probe(
url2, **FFMPEG_OPTIONS)
vc.play(source)

@commands.command()
async def pause(self, ctx):
await ctx.voice_client.pause()
await ctx.send("Paused")

@commands.command()
async def resume(self, ctx):
await ctx.voice_client.resume()
await ctx.send("Resumed")


async def setup(client):
await client.add_cog(music(client))

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