By Rupert Hargreaves The Hipgnosis Songs Fund has today reported an updated net asset value following the preliminary valuation report prepared by Shot Tower Capital. Shot Tower was appointed by the company as part of its strategic review of the value of its portfolio of music streaming rights. The board appointed the third-party advisor following disagreements between the company and its investment advisor Hipgnosis Song Management Limited, over the value of its assets. Shot Tower has performed a detailed review of the company’s portfolio, using a “variety of factors and assumptions,” about r…