Definition of colaboration

(Edward Jablonski, Harold Arlen Happy with the Blues....)

When Harold_Arlen returned to California in the winter of 1944 , it was to take_up again a collaboration with Johnny_Mercer , begun some years before .

Their first collaboration came close .

When Johnny_Mercer and Harold_Arlen began their collaboration in 1940 , Mercer , like Arlen , had several substantial film songs to his credit , among them `` Hooray_for_Hollywood '' , `` Ride , Tenderfoot , Ride '' , `` Have_You_Got_Any_Castles , Baby ? ''

His casual , dreamlike working methods , often as not in_absentia , were an abrupt change from Harburg 's , so that Arlen had_to adjust again to another approach to collaboration .