by Stephen Thomas ErlewineBoston's long-awaited fourth album, Walk On, which this time took Tom Scholz a full seven years to complete, failed to capture the attention of most AOR fans and became the group's first record to not spawn a hit single. Perhaps the reason was AOR and classic rock stations began losing their audiences in 1992; more likely, it was because Scholz's legendary perfectionism didn't yield the same results it did in the past. Although the production is certainly state of the art and is overflowing with detail, there aren't any memorable songs or hooks to justify such extravagance. On the surface, the record sounds fine, but there is no substance beneath the layers of gloss.