I didn't really hear any other music other than what my dad was working on until I was 12. My recollection of hearing other music was that I liked some things that I heard but I always thought, 'Where's the rest of it?' It didn't have the same amount of detail or instrumentation or imagination in the arrangements.

Summary

This quote suggests that the speaker, who likely grew up with a musical father, was exposed primarily to their dad's music until the age of 12. When they eventually heard other music, they discovered a lack of complexities that their father's music had. They appreciated the abundant detail, instrumentation, and imaginative arrangements in their dad's work and found other music somewhat incomplete in comparison. This implies that their early exposure shaped their perception of music and set a high standard for what they deemed satisfying in musical compositions.