Once upon a time, “Pet Sounds” seemed like the runt of the Beach Boys ‘ litter, at least on the record company ledger, if hardly by artistic reputation. But as the album turns 60 years old this weekend, it’s thought of less of a cult record, as it was considered for years or even decades after its release, than it is as a landmark work with virtual household-name recognition. Who doesn’t revisit this virtually symphonic song cycle about lonely adolescence without considering it one of the 10