Metronome marks with parentheses

When you use the \tempo command, you can add a metronome mark to it. If you want just the metronome mark, leave out the tempo name. This gives you a metronome mark without parentheses. If you want the parentheses around the metronome mark, use an empty string "" for the tempo name.

\version "2.26"

{
  \tempo "Allegro" 4 = 132
  c'1 1
  \tempo 4 = 100
  1
  \tempo "" 4 = 120
  1
}