String to scheme

[Paolo Prete]

Hello,

is it possible to make a music expression from strings? It would be useful
for building expressions with combination of string chunks. Something like:

%%%%
\version "2.19.45"

strToMusicExpr = #(define-music-function (parser location token1 token2
token3 mus) (string? string? string? ly:music?)
#{
    $token1 $token2 $token3 $mus
#})

{
   \strToMusicExpr "\\tweak" "NoteHead.color" "#red"
   c'
}
%%%%

I see that there's a ly:parser-parse-string function. But nor I understand
if it's safe, nor how does it work, nor if it's the right way to achieve
what I want...

Thanks
P