Columbia subject headings:
Love in art--Congresses.
Love in literature--Congresses.
Love songs--Congresses.
Love-letters in literature--Congresses.
Love-letters--Songs and music--Congresses.
Harvard subject headings:
Love in music.
Love-letters in literature--Congresses.
Love-letters--Songs and music--Congresses.
Music--History and criticism--Congresses
Princeton subject headings:
Love-letters in literature--Congresses.
Love-letters--Songs and music--Congresses.
Music--History and criticism--Congresses.