mobile

I'm back with Android after about 1 1/2 years with IOS iPhone 6. Is there a app that comes close to Apples iTunes Radio? I got used to listening to that because it was built into IOS. I know there is Pandora, Slacker..ect. Which one is the easiest and free of course. Most of those have a limit of 6 skips a hour. I seen there is Double twist music player, but is that also radio as well? I'm looking for something where I can save certain fav groups and play that style of music. Please help me out.