A Mouse Called Wolf, by Dick King-Smith, 1997

Wolfgang Amadeus Mouse, so named because the smallest mouse baby in the litter needed a big name to back him up, has rare musical gifts, which neither his siblings nor his mother can fully appreciate. But the old lady who plays the piano next to the mouse-hole soon discovers her pest protege, and there springs a warm and chocolaty friendship between them. Simple, sweet without sentimentality, with cleverly understated wit. Well suited to elementary readers but older readers will enjoy it also. Strongly recommended.