Favorite Top Five:
5. Smashing Pumpkins
4. Radiohead
3. Porcupine Tree
2. Tool
1. Dream Theater
Other bands/musicians, in no particular order
1. Godspeed You! Black Emperor
2. Genesis (old prog-rock era)
3. Pink Floyd
4. Moby
5. Steven Wilson (and all his music projects, including Porcupine Tree, his solo projects, etc.)