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First off hello-
I believe that since you do not have premium service you can not choice the specific songs on your android device.
However on your Ipad spotify was nice enough to give you some of the ability premium subscribers enjoy.
This frequently asked section of spotify's help i believe may help you.
I hope this helped you and dont hesitate to respond if you have any other troubles or just need help with spotify's apps or your account.
Have a nice day!!!