Possible Clues:

• Excited as sliding along the keys
• I sing with lads when playing what might be written in score
• Sliding, as playing these?
• In glass I'd shattered, playing, while sliding up and down the passages
• Moves from A to B, say, without stopping
• Musical terms that could be represented as sliding
• Slides (music)
• They are sliding, as played
• In Italian it translates as 'sliding one's fingers along the keyboards'
• Shifting, sliding as slippery semibreves