Currently, I use Rocket Player which is a very good app and syncs with some iTunes syncing apps such as iSync shown below. The free player is good but the paid version is the best @ $3.99!
Rocket Player (https://play.google.com/store/apps/details?id=com.jrtstudio.AnotherMusicPlayer&feature=more_from_developer#?t=W251bGwsMSwxLDEwMiwiY29tLmpydHN0dWRpby5Bbm90aGVyTXVzaWNQbGF5ZXIiXQ..)
Although you can download music from Google Play for your Android device, you may already have music in iTunes. Or there may be songs in iTunes that you just cannot get in Google Play at this time. Getting that music onto your device from iTunes can be a hassle...but not if you use iSync!
iSync (https://play.google.com/store/apps/details?id=com.jrtstudio.iSyncr&feature=nav_result#?t=W251bGwsMSwyLDNd)
This is a paid version and costs $3.99. Howver, if you have a large number of songs you wish to use on your tab it more than makes up for the price. The free version of iSync is not very good.