Looking For A Start In Music, Just ordered a new iMac G5 Options

[enygma]

Hi, I am kinda new to what is available in the world of the Mac. I have ordered a new iMac G5 computer with 512MB of RAM and started looking at Garage Band. I wanted to talk to my uncle regarding things having to do with music as he used a Mac to create the songs for all his albums using Digital Performer (not sure of the version). However, I am looking at Garage Band and Logic as possible options, but I am not sure where to start, or what equipment I would need, or how it all works. I used to do music tracking on my old 486 PC in DOS with Impulse Tracker 2.14, and I am wanting to get back into music.

What do I need to know to head in the right direction? What do I need to use? What is the differences between programs like Garage Band, Digital Performer and Logic?

Any help on this would be greatly appreciated. Thanks.

[enygma]

Ok, so I already have a cheap $120 MIDI supported keyboard I bought for my Fiance from Radio Shack. So with the Tascam US122 interface, am I able to hook up that keyboard and interface it with the software?

Plus, I notice after checking out this website (http://www.zzounds.com/item--TASUS122) that the interface is not supported under Jaguar. Is this old news or are there drivers that support Jaguar now? Any speculation as to whether it will be supported in Tiger or not when that hits the shelves?

I figured I might just play around in Garage Band for now, but look into using Digital Performer if I get to that point. My uncle has used DP to record most of his albums over the past many years so I figure it would be nice to have someone I know to talk to regarding it.

Anyways, I really appreciate your help so far.