Package not working: Command \semibreve etc. are not working

[francoisschwarzentruber]

Hello,

sorry to both you. I just installed the package. I wrote \usepackage{lilyglyphs} in the preambule. I use the command \semibreve in the main text. I use the very standard pdflatex and it makes the following error: Undefined control sequence.
If I write \semibreve a the message is then Undefined control sequence. \semibreve a. I do not know how to use this package :(.