Chords above notes for chant

[Br. Athanasius Pelletier]

I need to get the letters for the chords above certain notes in the example below.  I thought of using markup but I don't know if I can get sharp or flat symbols. I want "F" above the first f breve, a "B flat(symbol)" above the second F breve and "D min." above the last D.

Thanks


\version "2.14.1"

\include "english.ly"

#(set-global-staff-size 17)

\layout { 
    #(define fonts (make-pango-font-tree "Liberation Serif" "Arial" "Courier New" (/ 17 20)))
}

\paper {
    after-title-space = 0.0
    before-title-space = 0.0
    between-title-space = 0.0
    bottom-margin = 0.0
    foot-separation = 0.0
    head-separation = 0.0
    line-width = 4.5\in
    page-top-space = 0.0
    paper-height = 0.7\in
    paper-width = 4.5\in
    top-margin = 0.0
}

\header {
    tagline = ##f
}

stemOff = { \override Staff.Stem #'transparent = ##t }

\score {
  \new Staff \with { \remove "Time_signature_engraver" }
  {
    \key c \major
    \set Staff.instrumentName = "Tone 1"
  
    \cadenzaOn
    \stemOff
    c'4 d' \bar "|" 
    \hideNotes
    f'
    \unHideNotes
    f'\breve g'4 f'4 \bar "|"
    \hideNotes
    f'
    \unHideNotes
    f'\breve e'4 c'4 d'4 \bar "||"
  }
}