The music rest is not included with the GO:KEYS 5 or GO:KEYS 3. The dedicated music rest, MRGKS3/5, is sold separately and is available from an authorized Roland dealer.
Note: The MRGKS3/5 is not compatible with the GO:KEYS (1st gen.) music rest. For details, see the related article: "GO:KEYS 5, GO:KEYS 3: Do the music rests for GO:KEYS 3/5 and for GO:KEYS (1st gen.) have mutual compatibility?"