The main avenues for this would be the composer's official website, the publisher's site, or online music repositories like IMSLP. Let me verify if Bo Larsson's works are available through IMSLP. Wait, IMSLP requires that works be in the public domain, so unless the concerto is over a certain number of years old (depends on country), it might not be available there. Sweden has a copyright term of the author's life plus 70 years. If Bo Larsson is still alive, the work would definitely be under copyright. Let me check his birthdate. Bo Larsson was born in 1935, so if he's alive until now, the copyright would still hold. Therefore, the concerto is likely not on IMSLP.