Acquired from Hipgnosis Songs Fund in July, the 45,000-song catalog includes songs by the Red Hot Chili Peppers, Neil Young and Shakira.
A pair of lawsuits over $1.5 million in unpaid bonuses provide a look into the kinds of contracts that Hipgnosis entered into during its acquisition spree.
Trading of HSF shares were suspended Monday and will be removed from the London Stock Exchange on Tuesday.
With 99.97% of shares voted voting for its $1.6 billion offer, Blackstone now owns 100% of the company that popularized music as an asset class
The private equity giant is sticking to its offer of $1.31 per share, which values Hipgnosis Songs Fund's share capital at $1.584 billion.
Concord said on Thursday it would not raise its bid to beat Blackstone's $1.6 billion offer for the publicly listed music royalty fund.
Concord's offer of $1.25 per share has been rejected, with HSF directors now recommending shareholders go with Blackstone.
As Concord and Blackstone vie to acquire the embattled song fund, Merck Mercuriadis' future with its investment adviser remains unclear.
The investment advisor for the troubled fund says it has "repeatedly been blamed" for issues that were not its responsibility.
The board of directors of the music royalty fund say they would switch their support from Concord's bid to the private equity giant's offer if Blackstone makes it official.
