Chances are that they are still there but the indexing system has become scrambled so GarageBand is unable to find them. Apple has a step by step guide to rebuild the index. (See links below)
No, there is no Garageband app for the iPod Touch. Garageband can only be accessed if you have a Mac computer that either has iLife pre-installed on it, or if you have a Mac and buy an iLife disc to install Garageband. It is a software, not an app.
Garageband comes with over 1000 sample loops. You may not be seeing all of these because you have the "Filter for more relevant results" box ticked in the Loops section of Garageband's preferences. Untick the box to see all the loops listed. If this is not the case then you will need to rebuild your loop library. Double click on the Mac's hard disc icon, and then on the Library folder and then on the Audio folder. Drag the Apple Loops folder over the loop browser (lower right corner) in the Garageband window. The library will then be rebuilt. If there is no Apple Loops folder you will need to reinstall them from the original Mac OS or iLIfe discs.
The G3 iMacs were discontinued in 2003 and Garageband was not launched until 2004 so they would not normally have had Garageband installed. If an early version has been installed on a G3 iMac it will be of limited use as Garageband requires considerable processor power to handle multi-track compositions for which the G3 processor would not be suited.
Well no, not any for free, and none that specialize in Dubstep. But you could surf the web for free loops or samples.
Garageband can be purchased for the Mac for $14.99 from the App Store.
GarageBand is only available for Mac computers, it comes pre-installed on all current Mac computers that you buy from the store. If you have a Mac and your computer is missing it or you want to upgrade, you can buy it at the Apple Store or any other electronic store which sells Apple Computers.
An Internet connection is not required to run GarageBand on a Mac. It would only be required to download the music lessons available within GarageBand.
On a regular Mac GarageBand is located in the Applications folder.
GarageBand is only for Mac.
Garageband songs can be shared to iTunes or exported to a file as MP3 or AIFF files. Garageband songs cannot be exported to FLStudio, ProTools, Cubase, Sonar or other project file types. If you have Logic Studio, you can open Garageband songs and export the tracks to AAF or OMF files. The virtual instruments and loops that are included with Garageband cannot be used in other programs.
One app...garageband
Yes, you must have a Mac to install Garageband. You could theoretically install a Mac OS on a PC, however the legality of that is highly questionable considering the fact that the colloquialism for such a computer is "Hackentosh".