For the budding musician trying to learn a new instrument, music lessons - either online music lessons or private instruction - are great and important.
But learning to play along with real music, real songs is equally important. A good way of doing this is to use practice tracks.
A practice track, like the ones available at praxtrax.org, will often have the band parts (different musical instruments) broken out so you can see the written music for the part you are interested in.
So, for instance, if you are a new guitar player you'll find practice tracks of both simple songs and easy-to-follow exercises.
Not only will you see the music, but you can actually play the musical arrangement right in your internet browser. And you'll be able to play along with, learning the song and refining your technique at your own pace.
It's definitely the way to go.
Here's an example of a well known popular hit from just a year or two ago - Hey, Soul Sister.