Each jam track has a reference track that shows one way the bass can be played to both support the song and to add some melodic overtones. You can pick it up by ear or arrange your own bass lines and play them to the version of the track with bass removed.

When available, you’ll also get to hear a recording of a traditional artist performing their rendition of the song.


9-20 Special - Earl Warren

The track will give you a chart of the song you’re hearing. Listen to the reference track and read the chart as it plays. This will give you an understanding of how the key changes happen in the song. You’ll be playing those key changes with your bass lines.

Remember: You can hear a bass played on the reference track, but you’ll be injecting your own bass lines, or reproducing the reference bass when you play to the bassless version. You’ll be playing jazz!

Want to review what some of the symbols on the chart mean or get a fix on what chord tones patterns are going to work while you play? Jump over to the PERFORMANCE TIPS section.


Not sure what to play? We’re going to help by showing you a pattern of notes you can play in the described key. Put the (R) Root Note on the note being shown on the chart and lay within the corresponding note to make a melody line. As a bassist, you’re going to be familiar with a regular 4 sets of chord tone patterns, and you can use the patterns to get you started.

The chord tones will be easy to understand by simply looking at the image of the pattern, you’ll pick it up easily and be playing the track in minutes! You can start with root notes to familiarize yourself with the song and the tempo, then expand your bass lines to include a more melodic structure, passing tones and more. How you play it is up to you!

Every time you see a note on a chart, there is some kind of description to it. The letter and the descriptor are going to tell you, the bass player, what chord-tones you can ring out or pluck to make a melody line in that key. For instance: Cmin7. Here is where you’re going to use 4 patterns to get into the groove. Understand, there are certainly more than 4 chords to know when playing any music, but it will be important that you become familiar with 4 chord-tone patters:

  • The Major 7th
  • The Dominant 7th
  • The Minor 7th
  • The Minor 7th flat 5

A full explanation of chord tones is available by CLICKING HERE.

When we give you a chart, reference track and play along track, you’ll also see the patterns you’ll be able to use to play along. Remember, you can start with the root notes to familiarize yourself with the tempo and changes, then use the patterns to add your melodic flair.

Here’s what those chord tone patterns will look like when you click to play a jam track.

When available, we’ll share some background on the track you’re playing, known artists who’ve contributed to or recorded the songs and even share YouTube video links where artists perform the songs live. It helps to see how other people express the songs in their style. You might be jamming to a track at 90bpm in the key of C, but you’ll hear other people play it at other tempos, in other keys and with other accompanying instruments. Jazz is amazing that way, there are really no rules to how you play a song, so long as you’re in key.