That accordion sounding instrument on The Door's - Hyacinth House. Is it an accordion, harmonium or one of Ray's keyboards making that sound?
In his honour after his unfortunate demise the other day, Where Do You Go To My Lovely by Peter Sarstedt:
I'd forgot the subtle accordion on track "Sweet Tuesday Morning" off Straight Up album! The 2010 Remaster has nice clarity, like standing in the Studio "Live".
As the lead instrument and with so many to choose from, I will go with: "Make it Stank" - Beau Jocque & The Zydeco Hi-Rollers.
Not only an accordion solo (starting around 2:12) but a banjo intro. It may not be virtuosic but it does have a buoyant pulse and contains some of my favorite lyrics: "I Believe" -- R.E.M.
Bob Dylan's Joey and Rod Stewart's cover of Dylan's Mama You''ve Been On My Mind from Never A Dull Moment.