Nootka
Linux has many small tools that allow music enthusiasts to practice reading musical notation. Nootka [1], by developer Tomasz Bojczuk, offers an extensive program that helps guitarists learn notation (Figure 1).

The program, which runs on many platforms (see the "Installation" box), trains basic musical knowledge and the ear. The software can only display and play whole notes and is thus not suitable as a tool for composing music. Nootka does not allow for odd metrics, rhythms, and subtleties such as triplets, nor does it support chords. Instead, it helps you concentrate fully on learning the difficult art of recognizing notes in classical notation.
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