These music books are great for anyone interested in piano and harpsichord history. To use them, simply open the pages and start reading to gain knowledge about music. When handling, be gentle, especially with 'Playing the Piano for Pleasure' as its binding is unstable. To maintain them, keep the books in a cool, dry place away from direct sunlight to prevent further yellowing and damage. Avoid getting the pages wet. If you want to share them, make sure to handle them carefully so others can also enjoy these vintage reads.