ABSOLUTELY!All WDW Resort pools are open 365 days a year.The only exception would be for a pool refurbishment.All-Star Music has 2 pools(Calypso and Piano)so even with the slight chance of a refurb during your trip,they don't refurb both pools at the same time so one and MOST likely BOTH will be open.You can also walk over to Sports or Movies and use their 4 pools.