You are very welcome!
Two options for music, and bear with me because I will try to explain deeply so you don't get confused. One is set up locally, and ran locally (Double Twist), the other is set up through the cloud with the option of storing it locally on your phone (Play Music).
If you want to manage your music in that way, and already have itunes, I would recommend an app called "DoubleTwist." Go to the internet and download it (free). It is just like iTunes, except it does everything over there air (wifi). Your music will be synchronized as soon as you walk in your wifi zone. You will then go to your phone and download these two apps:
https://forums.androidcentral.com/e...idPlayer&feature=search_result&token=QMnatAWx.
https://forums.androidcentral.com/e...erProKey&feature=search_result&token=Qh8mELHT.
One is for the double twist app on your phone, the other is for the wifi sync part of it. Ever since Android moved to Android 4.0, the Double Twist team has made it a wifi sync application. Once the desktop version finished downloading, launch it, and double twist will bring in all of your itunes music and playlists into the double twist client and thus, your phone as long as it is connected to the same wifi network.
If you don't listen to music that much every day, and have a good amount of data on your plan, I would HIGHLY HIGHLY recommend you use Google Music for your music needs. It is fully cloud operated, and the good part is that it works flawlessly with itunes, bringing in your playlists and muisic to the cloud. This will store all of your music for free on google's servers, unless you have more than 20,000 songs. In which case, you will have to pay a little. To do this, you don't need to do anything on your phone other than have a gmail/google account. You already have an app called "Play Music" on your phone, which is the right app. Go to your desktop/laptop that has your music, and search the web for Google Music Manager. Download the software and launch it. It will then take all of your itunes music, and any other folders that you tell it to take, into the cloud and immediately available on your device. You can set 10 devices over the cloud to use your google music library which means you can access your music ANYWHERE. As soon as you buy a new song on itunes, it will be on your phone flawlessly. It is awesome. But again, it requires data streaming AT FIRST.
After you set up the cloud, there is a little button on your phone's Play Music app that looks like a little pin. If you press this, the songs you choose under that pin will be downloaded into your phone. This is good because if you have a very large collection, all you need to pin is the music or playlists you listen to most.
So both options are good, but in the long run, I recommend Google Music Manager. Both methods should give you album art, but I am not sure of the effectiveness. I would not use Samsung's music player, but keep in mind that Smasung's music player will also show any songs you have on your phone's storage or SD card.
Google Plus, in my experience, has kept the photos in full size. Google Drive is absolutely usable and a much more complete solution. The reason I don't use it for photos is because of the interface. Google + User interface looks and functions better for media like photos, looking like a photo gallery on an iphone or Galaxy S4. Google Drive looks just like your file explorer on your Windows machine. So google drive is an awesome app to keep files, and I would compare that to iCloud, while I would compare Photostream to Google + Instant Upload.