I chose JS Bach. As an organist, my interest here is not only in the great man himself but also the influences upon him (like Buxtehude), related contemporaries (like Johann Gottfried Walther), pupils (like Krebs), and other Bach survivalists (like Josef Seger).
This "Inner Bach" to "Greater Bach" interest is, in turn, part of a general interest in the Baroque period.
My other major musical preferences include Mahler, the English Pastoral movement (eg Vaughan Williams), and Neoclassicism (eg mid-period Stravinsky, like Pulcinella or Dumbarton Oaks)