Mathematics and Music

Across

1. Slope or rate of change indicator

2. Third letter of the Greek alphabet

3. Three times as much

4. Result or consequence of an action

11. Writer of song words

12. Three times over in old fashioned style

13. More than one of something

Down

5. Number after fourth in sequence

6. Creates original musical works

7. Zero score in British football match

8. Information collected for analysis

9. Half a century in numbers

10. System of measurement used worldwide