Brazilian .kar files:
http://www2.uol.com.br/cante/new/musicas.htm
http://cf.uol.com.br/cante/music.asp
http://jomais.comunidades.net/midis
http://abelhas.pt/zangaomestre/Karaoke/Midi+-+Kar

Other .kar files:
http://karaoke.morenciel.com/

Python Dependencies!!!
Mac OS X Install:
- Audacity
- soundstretch
- pygame: macosx 10.7+
- XQuartz
In terminal:
--- Command Line Tools: xcode-select --install
--- Homebrew: ruby -e "$(curl -fsSL https://raw.githubusercontent.com/Homebrew/install/master/install)"
--- ffmpeg: brew install ffmpeg
--- timidity: brew install timidity

Linux (Ubuntu) Install:
In terminal:
- Audacity: sudo apt-get install audacity
- soundstretch: sudo apt-get install soundstretch
- pygame: sudo apt-get install python-pygame
- ffmpeg: sudo apt-get install ffmpeg
- timidity: sudo apt-get install timidity