What makes Songbuk ng APO by APO Hiking Society notable?

'Songbuk ng APO' is notable for its commercial success, highlighting the enduring popularity of APO Hiking Society in the Philippines. The album includes beloved tracks that have become staples in OPM (Original Pilipino Music), contributing to the cultural landscape of the era and influencing subsequent generations of Filipino artists. Released in 1991, 'Songbuk ng APO' marked a significant moment for APO Hiking Society as their first album after a brief hiatus. The group was re-establishing their presence in the Philippine music scene following the cultural shifts of the late 1980s, which had influenced their sound and songwriting approach. This album solidified their status as icons of Filipino music during the early '90s.