Here are a few links to external web sites and content that you may find useful:

 Here's a link to a great site for guitar tabs for a variety of instruments. There is also a feature

to transpose any of the songs to a key you are more comfortable with to best suit your vocal range.

 ultimate
 
 Great site for guitar chords and a chord chart which is downloadable  truefire
Audacity music editing software as demonstrated by Barry Jones audacity