Possible Clues:

• Perform music without written score
• Perform music without reading it (In this answer, note letter 5)
• Perform without written music
• *Improvise (see letters 6 to 9 in this answer)
• Improvise drama, extra filling in part
• Fruit brought round rest area — take it as it comes
• Conference, say, includes rest — times to improvise
• Perform music with no score
• Improvise drama audibly
• Proceed by instinct - without sheet music?