The template shouldn't add a space artist name

patacrep/songs/chordpro/data/chordpro/song

@@ -13,7 +13,7 @@
 (* endfor -*)
 
 (*- for author in authors -*)
-  {artist: (( author[1] )) (( author[0] ))}
+  {artist: (( author[1] ))(( author[0] ))}
 (* endfor *)
 
 (*- for key in ['album', 'copyright', 'cov', 'tag'] *)

patacrep/songs/chordpro/data/latex/song

@@ -16,7 +16,7 @@
 }[
   by={
       (* for author in authors *)
-        (( author[1] )) (( author[0] ))
+        (( author[1] ))(( author[0] ))
         (*- if not loop.last -*)
         ,
         (* endif *)

patacrep/songs/chordpro/test/author_names.sgc

@@ -0,0 +1,6 @@
+{language: english}
+{title: Title}
+{artist: The Beatles}
+{artist: Oasis}
+{artist: The the beatles}
+

patacrep/songs/chordpro/test/author_names.source

@@ -0,0 +1,4 @@
+{title: Title}
+{artist: The Beatles}
+{artist: Oasis}
+{artist: The the beatles}

patacrep/songs/chordpro/test/author_names.tex

@@ -0,0 +1,12 @@
+\selectlanguage{english}
+
+\beginsong{Title}[
+  by={
+        The Beatles,
+        Oasis,
+        The the beatles  },
+]
+
+
+
+\endsong