For repertoire guides for specific instruments, search '[instrument] and bibliography' by subject or subject keyword, e.g. 'flute and bibliography.' Also see the music research guides for specific instruments.
Emmons, Shirlee. The Art of the Song Recital. MT892 .E54 (ebook at the Internet Archive, https://archive.org/details/artofsongrecital0000emmo)
Yaklich, Richard Eldon. An Orchestra Conductor's Guide to Repertoire and Programming. ML128 .O5 Y25 2003
Diamond, Harold J. Music Analyses: An Annotated Guide to the Literature. Music Ref. ML128 .A7 D5 1991
Hoek, D.J. Analyses of Nineteenth- and Twentieth-Century Music, 1940-2000. ML113 .H695 2007
Program notes - Boston Symphony Orchestra. 1881-1962. Gov't Publications Microfilm ML28 .B67 B67
Programs, Houston Symphony. 1931 - 2006. ML28 .H6 H67.
Lyttleton, Donald V. Repertory of the Houston Symphony Orchestra, 1913-1988. ML28 .H67 H77 1989
Voorhees, Anna Tipton. Index to Symphonic Program Notes in Books. Music Ref ML128 .O5 1970
Braunstein, Josef. Musica Aeterna, Program Notes, 1961-1967. MT90 .B82 1973
Biancolli, Louis Leopold. Analytical Concert Guide. MT125 .B46 1951
Seaman, Julian, ed. Great Orchestral Music: A Treasury of Program Notes. MT125 .S34
International Trumpet Guild. Trumpet and Brass Programs, 1990- ML1 .T78