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.
HSF shares have recently been trading above the latest offer prices, suggesting some investors expect the bidding to continue.
The Nashville-based company is now offering $1.25 per share, a penny more than Blackstone's possible bid, and says it wants to sell 30% of the fund's assets.
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.
