\include "festival.ly"
\festival #"song-slurs.xml" { \tempo 4 = 100 }
<<
\relative \context Voice = "lahlah" {
\set Staff.autoBeaming = ##f
\include "festival.ly"
\festival #"song-slurs.xml" { \tempo 4 = 100 }
<<
\relative \context Voice = "lahlah" {
\set Staff.autoBeaming = ##f