Might sound crazy, but I actually went through it all lol. For music you may want to consider the lastfm cog. I use it for movies so I have themoviedb cog and created my own letterboxd cog.. not great but it works. i also use aiuser with an API, useful to get some (old) information and you can set it up to roast people or talk in a certain way. cleanup is another useful cog to quickly clean up a lot of messages quickly (delete from message ID, delete messages between message ID1 and ID2 etc). i use the system cog to get server cpu/ram/hd usage.