You can install iDownloader or Xender app from AppStore .Both of these apps has in-app browser in which you can download songs. However , I don't think you can install cracked apps without jail breaking :) :)
Apple iPhone 5c 16GB is good option you can look for it has a 4-inch Retina display with a 326ppi pixel density, and provides an excellent contrast, sunlight legibility and colour reproduction. It is protected by Corning Gorilla Glass and an oleophobic coating to prevent it from getting damaged and scratched.Apple iPhone 5
Personally i feel that iPhone 5s is not a good option in 2017 to go for. As it has old generation processor, only 512Mb RAM , doesn't support VoLTE . However , if you want to experience iOS in low price only then go for this.