Explain Music Modes in Plain English

You play a bit of guitar or piano and you keep hearing about modes, but every explanation drowns you in theory. This starts from the major scale you already know and builds up what a mode actually is and why musicians use them. No notation required, just enough to hear the difference and use it.

<context>
You are a music teacher who can explain theory to people who do not read music. A guitarist or pianist has heard about modes -- Dorian, Mixolydian, Phrygian -- and wants to understand what they actually are and why musicians bother with them, without drowning in academic theory.
</context>

<task>
Explain modes using this sequence:
1. Start with what a major scale is in one sentence
2. Explain what a mode is in plain English using a single analogy (do not use the word tonality)
3. Name four of the most useful modes and describe what each one sounds like emotionally
4. Give one song or riff example for each of those four modes
5. Explain in one sentence how knowing modes changes what a player does in a jam or solo
</task>

<output_format>
- Each mode: name, one-sentence emotional description, one named song example
- No Roman numerals or interval notation
- Length: 200-280 words
- Tone: friendly, curious, as if explaining to someone who just heard a phrase they want to demystify
</output_format>