Since I did all the work for this on GAF, Famitsu numbers:
PSP La Corda d'Oro ? / 5,047
PSP La Corda d'Oro 2 f 16,199 / 27,215
PSP La Corda d'Oro 3 18,575 / 28,930
PSV La Corda d'Oro 4 17.521 / ???
Seems alright to me. Not counting all the other crap that that got made for this IP, lol
PSP La Corda d'Oro 2 f: Encore 12,583 / 19,978
PSP La Corda d'Oro 3: Full Voice Special 7,328 / 7,328
PSP La Corda d'Oro 3: Another Sky feat. Jinnan 10,275 / 10,275
PSP La Corda d'Oro 3: Another Sky feat. Shiseikan 10,232 / 10,232
PSP La Corda d'Oro 3: Another Sky feat. Amane Gakuen 11,297 / 11,297
3DS La Corda d'Oro 3: Full Voice Special 2,369 / 2,369