Tablature is a method of indicating the position of notes on the fretboard. There are four tab lines, each representing one of the four strings on the bass.
When a number is placed on one of the lines, it indicates the fret location of a note, e.g.:
This indicates the 4th fret of the second string (an F# note).
This indicates the 7th fret of the 4th string (a B note).
This indicates the open third string (an A note).
The tablature, as used in this book, does not indicate the time values of the notes, only their position on the fretboard.
* Note readers may need to refer to the tablature to determine the position of an exercise.