Jeez...narrowing it down to just five?
Andy Partridge/Colin Moulding (XTC)
Neil Finn (Crowded House/Split Enz)
Joni Mitchell
Mark Hollis (Talk Talk)
Robert Pollard/Tobin Sprout (Guided By Voices)
I'd also include Elvis Costello, David Byrne, Joe Jackson, Peter Gabriel, Paddy McAloon (Prefab Sprout), Ray Davies (The Kinks), Bryan Ferry (Roxy Music), Tim Smith (Cardiacs), Thomas Dolby, Neil Hannon (The Divine Comedy) and Stan Ridgway (Wall of Voodoo), along with the standards of Lennon/McCartney and Brian Wilson. All phenomenal talents who I learned many, many things from.