PRISM should lasts until spring 2015 (without a re-release) so the better single choices must be:
4. Birthday (April-August) for Summer
5. Legendary Lovers (July-Nov) for Fall
6. Ghost/It Takes Two (Nov-Feb) for Winter
7. Walking on Air/Double Rainbow (Feb-May) for Spring
...There you go! Releasing TIHWD is unneccessary if you have Bday and WOA in the album
If there’s an obvious chart-topper on Prism, it’s definitely “Birthday.” The effervescent nu-disco number is about as radio-friendly and catchy as it gets, and Bruno Mars just had a huge hit with the very similar-sounding “Treasure” last year.
PRISM should lasts until spring 2015 (without a re-release) so the better single choices must be:
4. Birthday (April-August) for Summer
5. Legendary Lovers (July-Nov) for Fall
6. Spiritual (Nov-Feb) for Winter
7. Walking on Air/Double Rainbow (Feb-May) for Spring
...There you go! Releasing TIHWD is unneccessary if you have Bday and WOA in the album
spring smash Birthday replace Happy...Happy Birthday
summer smash This is how we do
Fall smash legendary lovers
winter hit Ghost/Double Rainbow
spring hit Walking on air/Int'l smile
Now I need WOA for Summer, LL for Fall and Ghost for Winter 
