Possible Clues:

• Play a piece of music without practising
• Play music without preparation .
• Perform on the spot
• Skilful players should step on an expression of regret
• Play unprepared lament and march
• Interpret music without preparation
• What many musicians can do
• Player isn't prepared to deal with score like this
• What a musician may do is express relief and walk
• What accomplished musician does to express emotion on track