I have a Macbook Pro with 4GB RAM & normal HDD and I don't recommend upgrading past Mountain Lion, since Mavericks uses at least 3GB after booting up. I'm guess

I have a Macbook Pro with 4GB RAM & normal HDD and I don't recommend upgrading past Mountain Lion, since Mavericks uses at least 3GB after booting up. I'm guessing Apple engineers are provided with Mac Pro with blazing speeds so they don't understand the pain of using the latest OSX with 4GB RAM & normal HDD. As for Spotify, it consumes a lot of memory. You'd better off with iTunes.