Folk legend diagnosed with Lyme disease.
Folksinger's periodic search attracts 500 applicants this time.
'Not used to this much joy, or this much champagne at this hour,' best-actor nominee Colin Firth said in a statement.
Tom Rush, Maria Muldaur, other artists he mentored pay tribute to Lifetime Achievement Award recipient.
Clip features two hot young Hollywood stars, Robyn Tunney and Luke Wilson.
First as Club 47, then as Passim and Club Passim, music "just comes out of the walls here," owner says.