"I've heard his fucking new record 'cos I fucking sung on half of it," Liam told Contact Music. He explained that many of Noel's new songs were works in progress while the band prepared their 2008 album Dig Out Your Soul.
It is unclear how much Liam, currently the lead singer for the band Beady Eye, actually knows about his brother's new recordings. The two are said to be estranged, and no specific details about Noel's album have been made public.
It's also a bit hard to understand why he is so upset about Noel possibly recycling that material. Though Liam had songwriting credits on later Oasis albums, the two did not collaborate in writing music.
It's not unusual for artists to flesh out material for a solo project that was written while they were still in a band. For example, some of the tracks on Stephen Malkmus' debut album were rehearsed with Pavement, and much of Prince's Sign O the Times was written before he disbanded the Revolution.