Simplify the following text for a Grade 6 native English-speaking person.
Original: In explaining why front man Liam Gallagher did not sing the song , Noel claimed that : '' ( Vocally ) Liam just could n't get that one .
Simplified: He said why front man Liam Gallagher did not get to sing the song : '' ( Vocally ) Liam just could n't get that one .