Diverse musical styles, rather than periods, characterized the major portion of Sunday’s (March 28) concert by the Orchestra of Indian Hill at the Littleton High School Performance Center. Works by Stravinsky, Debussy and Carl Nielsen were composed within about 30 years from the late 19th to the early 20th century. Not to slight the orchestra or conductor Bruce Hangen, but what many or most concert-goers came to hear instead was what classical-jazz flute virtuoso Jim Walker can do with his instrument.