...Well I'm going to assume that since at 2 different points you get "1 starstone," that you get all the rewards. (otherwise, it would only say "1 starstone" for one prize, not 2 of them.)
~edit~
LOL DAC SAID EXACTLY THIS TOO. xD
...and if I play in the morning and at night, that's 3 songs each... that's 1200 for me... I don't really have too much time to play every day... I can maybe get 1800 if i stay up long enough.... that's not gonna be too close. xD I just gotta try and play as much as i can. xD