Screwlab is a program designed for slowing down and recording the playback of MP3 or WAV files. It allows you to play and chop songs in mp3 format. You can also speed up the playback of a song. So if you have a screwed song and you want to hear it at normal speed then you just speed it up with the touch of a button. Add a mic and you can give shoutouts on your remixes. Other features include tag editing, choosing bitrate to encode, and ability to record from streaming audio.