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The circuit you found with the TIP31 power transistor is an "Instructable". Most instructables are designed by people who know nothing about electronics.
I had enough parts to try JcLrd's schematic he kindly posted. Thanks. I didn't have the right size capacitors so I ended up substituting 100uF for 220uF and 33uF for 47uF. I don't have any 2N3904 transistors though, so I used TIP31C transistors instead. Its all I have :/ If it makes a difference I would go get some of those transistors though. Does it make a difference? The circuit worked as intended but only 1 LED was turned on out of the two.
If I wanted to amplify the signal further by using another transistor would it look something like this? (schematic is attached). Thanks again everyone.
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