better song solution

using dropbox for songs isn't great. we should look into something that is easier (especially for adding new users). just spitballing:

- put stuff on s3
- links to youtube videos (https://github.com/mps-youtube/mps-youtube or https://unix.stackexchange.com/questions/229787/audio-only-youtube-player)
- choose a Spotify song (https://github.com/pwittchen/spotify-cli-linux)