Even though the song isn't one of the most important on the album, it represented for me what the album was all about. If there wasn't someone who was going to use rock 'n' roll, then I'd do it."
The speaker believes that even though the song may not be the most important track on the album, it still holds significance and reflects the overall theme of the record.  If no one else were to embrace rock 'n' roll, the speaker would take charge.