(Reuters) – Struggling British music investor Hipgnosis Songs Fund said on Thursday it had called for an extraordinary shareholder meeting to vote on a special resolution that could help the company draw potential bidders. Investors wanted to address the ‘call option’ held by its investment adviser, which has created a “deterrent to potential bidders for the company’s assets, thereby depressing the value of the company,” said Chairman Robert Naylor, who joined the board in November after a shareholder revolt in October forced the fund to reorganise its business. The new board proposes to amend…