I use guitar and
drum trainer 2 by renegade minds.
They have a way newer version out, so this one is free. It looks very basic.
You can speed up or slow down music in percents, so I usually start slow and keep going up by 5% at a time until I get to the normal tempo.
You can also set it to loop at certain parts of the song. Great for trying to nail that riff or solo. I love it
Download here
http://www.softforall.com/HomeEducat..._205120024.htm