[Gladstone]

1. Radiohead
2. Dave Matthews Band (Pre 2000 i.e. "Under the Table and Dreaming", "Crash" & "Before These Crowded Streets" - some of the finest albums of the 90's - it just sucks the Dave Matthews Band has since then only put out ****ty pop crap, an eternal loss)
3. Béla Fleck and his bluegrass buddies (NOT the Flecktones)

 

[DiamondHead]

Hard to make a top 3. Megadeth is my top 1 for sure...
1-Megadeth
2-Metallica'83-'91
3-Guns N' roses

 

[logwed]

Yes
 
The Flower Kings
 
Van Der Graaf Generator

 

[tru blu]

The Clash
Parliament-Funkadelic
The Minutemen

 

[paulb09]

Nine Inch Nails
Black Sabbath
The Chemical Brothers

 

[desktophifi]

Nightwish
Lacuna coil
Epica...three of my fav. 

 

[Sunmermaster]

why not 4 favorites? (sorry Richie Kotzen) XD
 
-Paul Gilbert
-Joe Satriani
-Steve Vai

 

[tyrael]

Nightwish
Within Temptation
Epica

 

[Laokid18]

Radiohead
The Clash
The Beatles.

 

[Pm0unt]

The Grateful Dead (The only one that stays constant)
Flogging Molly
The Holly Cole Trio

 

[priest]

The Rolling Stones
Sonic Youth
Beastie Boys

 

[Yuceka]

Dream Theater 
Rush 
Megadeth 

 

[revolink24]

I can't really answer the OP's question. But I think it's time for me to post something in this thread.
 
I'll say the ones that have been getting the most playtime in the last few months.
 
Dead Can Dance
Pink Floyd
Echo and the Bunnymen

 

[GyuszoHun]

- Two Steps From Hell
 
- Delta Goodrem
 
- City of the Fallen

 

[basementdweller]

Top three ever is a difficult question.
 
1)Smashing Pumpkins
 
2)Tool
 
3)About 20 different bands from NIN too Paramore too Kill Hannah...can't peg number three because there are too many great bands.