What does Google say is the second lesson that a musician should know?

The "second lesson" for a musician, after understanding basic musical notes and rhythm, is generally learning scales and chords. These elements are the fundamental building blocks of melodies and harmonies and are crucial for developing instrumental proficiency and aural skills. 
Here is a common progression of foundational musical lessons:
  1. Basic Music Theory, Pitch, and Rhythm: The initial step involves recognizing note names (A-G), understanding fundamental rhythmic values (whole, half, quarter notes), and grasping the basic pulse/beat of music.
  2. Scales and Chords: This second phase focuses on the structure of music itself.
    • Scales: Learning major and minor scales introduces the sequence of notes that form the foundation for most melodies. Practicing scales builds finger agility and an understanding of key signatures.
    • Chords: Understanding how to build and play chords (combinations of notes played simultaneously) is essential for creating harmony and playing along to songs.
  3. Ear Training and Sight-Reading: Subsequent lessons focus on developing the ability to recognize pitches, intervals, and rhythms by ear (aural skills) and the capacity to read and perform music from a sheet without prior practice (sight-reading).
  4. Proper Technique and Purposeful Practice: Alongside theory, a critical "lesson" is the development of proper playing technique to avoid injury and the discipline of focused, consistent practice to make real progress. 

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