LenMus Phonascus 3.5.1 is an excellent tool that uses tutorials to teach you a complete glossary of musical terms (chords, intervals, notes, contratempo, keys, etc) helping you read musical scores through practical examples without any problems. It will also show you how to compose in a pentagram, perfecting both your musical language and your ear.
At the end of the tutorial (and after many exercises) you will read and write music in a pentagram with no problems, and like a true composer.