OK now that i am on a computer i can write a walk through... space bar is broken though. At least it is still easier that using a tablet. For some reason Android tablets don't play well with google groups.
So, Rooting gives you full access and control over your phone. instructions for how to root are device specific. so i would start by searching for "YOUR DEVICE one click root" 2
ex. samsung galaxy s2 one one click root
some devices are easier to root than others. i cannot provide steps for your particular device, but through google you CAN find everything you need.
some devices have one click root tools, some do not, so the rooting process is more in depth for those devices.
rooting instructions are so device specific i could not find a generic set of instructions, and don't want to mislead anyone by linking them to a set of instructions not compatible with their device.
There is a risk of bricking your device (making it inoperable) while rooting, although the risk is minimal... almost non existent if you carefully follow instructions. I have rooted 5 seperate devices without bricking any, and, in most cases even if bricked the device can still be restored.
there are additional benefits to rooting, such as overclocking
for example my Galaxy S2 normally runs at 1.5 GHZ, i have increased the speed to 1.8GHZ
Now that you are rooted...
First, to install script manager just go to google market (Play Store) and search for script manager
in es file explorer click the menu button, and select "new"
when prompted select "File"
name your file something you'll remember
Click your new file
when prompted select "Text"
type this EXACTLY how you see it
Mount - o bind sdcard2/music sdcard/Android/data/com.google.Android.music
press back and when prompted to save click yes
now on es file explorer click "Favorites" (the star)
a new menu will pop up, at the top you willsee a picture of a phone with "/" underneath it click the phone
this will take you to the root directory
click the folder Sdcard2
click the menu button, and select "new"
when prompted select "Folder"
Name the folder music
Your script and destination music location are created
now open script manager
find your script which should be located in the directory /mnt/sdcard and the file name you chose earlier
select the script
open as script/executable
make sure script is selected not executable
click the buttons for "Su" and "Boot"
Go to google music (play music now) settings and clear any music that is currently saved to your device.
this only applies to music made available offline. If you do not clear it before running the script the music will exist on your internal Sdcard but not be accessible.
now reboot the script will run at boot a prompt will appear asking for superuser rights, click yes and remember this selection (it may say something different than remember this selection whichever option resembles remember needs to be selected.)
your music should now save to sdcard2/music but the device will still think it is saving to the default sdcard/Android/data/com.google.Android.music
You can check this by going to google music. Selecting "make available offline" and look at the free space. It should shoe the space available on your external sdcard.
So try your hardest to figure out how to root using google, and if your not confident enough to attempt it this fix may not be for you.
if you have tried everything you can and are still stuck message me back, including what device you have, and i will see if i can find a link to the rooting instructions for your particular device.
I assume no responsibility if you damage your device... These steps do work, and if followed will fix your music issues as well as introducing you to a world of additional benefits of being a rooted user.