Solve me to discover the numbers you need

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Across
  1. 2. Half a dozen
  2. 4. Where all the magic (and nerves) happen
  3. 6. You would likely find this in a time signature
  4. 7. Old-school music format that’s making a comeback
  5. 8. The last number you need
  6. 9. The mood, the energy
  7. 10. Extra performance given at the end of a show
  8. 11. What you do to your instrument
  9. 13. A group of people making noise (usually on purpose)
  10. 15. The kind of mates we have here, also a type of music
  11. 16. How we plan to spend our afternoon
  12. 19. Dance style common in rock concerts (and occasional LC chaos)
  13. 20. A set of musical notes in order, like major or minor
Down
  1. 1. A live music performance
  2. 2. The planned order of songs in a performance
  3. 3. When different notes blend beautifully
  4. 4. Last years Learn Club
  5. 5. A repeated chord progression or refrain in rock music
  6. 6. Part of a guitar neck that helps change pitch
  7. 8. Group of people that fill your cup up
  8. 12. Turn it up, always
  9. 14. Short for the equipment that makes you LOUD
  10. 17. Three or more notes played together
  11. 18. An informal music session or group improv
  12. 20. A section where one performer plays alone