For me (not surprisingly) - and in agreement with Roo, it would be slower, more contemplative versions of the old Jazz standards I like to (re) arrange:
The Very Thought Of You, The Way You Look Tonight, Funny Valentine , All The Things You Are - e.t.c
If alowed to use CDs, then knock up a a compilation using selected portions of Bruch's violin concerto, certain lush pieces by Gustav Mahler, Leos Janaceck, Chopin and ballads by Gretchen Peters , Norah Jones, Michael McDonald , The Eagles , Tom Waits and ( later era ) Curtis Stigers. :)