Possible Clues:

• Gradual decrease in speed (of music)
• Slowing down later on land ploughed up
• Becoming slower when dealing with notes
• Learnt an old move, but getting slower
• Getting slower, bent old man learnt to avoid motorway
• Becoming slower (mus.)
• Having extracted energy, real fast, and nothing slowing
• With a gradual decrease in speed (music)
• Notedly becoming slower
• With a gradual reduction in speed