(Refiles to add media packaging search code) Jan 21 (Reuters) - Record producer Bob Rock has sold his producer rights for a catalogue of 43 songs, including heavy metal band Metallica’s self-titled album and singer Michael Bublé’s “Call Me Irresponsible” to Hipgnosis Songs Fund . Investment firm Hipgnosis Songs announced on Thursday a discounted placement offering of its ordinary shares along with the deal, which is at least the fifth for the London-listed company this month after having struck agreements with Shakira and Neil Young. (Reporting by Pushkala Aripaka in Bengaluru, Editing by Sherry Jacob-Phillips)