What smartphone should I get upgrade to that offers good music options with mp3, and fast internet browsing?

So I am upgrading my standard phone to a smartphone as I had my old one since 2009, so I am in need of an upgade. I am looking to get a smart phone, and I would rather get one that offers a great music players that I can download my music into it, supports micro SD cards, and has fast internet browsing. I dont plan on using other apps like facebook, twitter, selfies as I have no interest in those. I was thinking an iphone 6s plus but that may be too expensive. What are some very good options?