AudioGrab is a basic script to playback audio from a Youtube video via youtube-dl and mplayer.

It is designed specifically for G3 Macs that can't stream youtube audio using the more recent mplayer in AudioStream.

REQUIREMENTS

The latest youtube-dl is required:
http://ytdl-org.github.io/youtube-dl/download.html

Python is also required for youtube-dl to run:
https://www.python.org/downloads/release/python-278/

The youtube-dl executable should be placed in:
/bin

Once placed, enter this command in Terminal:
sudo chmod a+rx /bin/youtube-dl

INSTALLATION AND HOW TO USE

From the AudioGrab archive place mplayer into /Applications 
AudioGrab can be placed anywhere convenient eg Documents and a shortcut made in the Dock.

To use, copy your chosen Youtube URL - this can either be from the video's page or from it's listing in a search result.
Then click the AudioGrab shortcut in the Dock, Terminal will open and activate youtube-dl - the parsing of the URL can take a while so be patient.
The video will then be downloaded into the Documents folder, upon completion mplayer will execute and start playing the audio.
Playback can be cancelled by pressing ctrl+c.
Once finished, the file is deleted and Terminal will close.
