From another site:
During one of the quieter moments in "The Electric Co.," Adam Clayton plays a three-note bass line (ding, ding, ding) and Bono answers back with a few lines sung to the tune:
"Shhh... 2-3-4. 2-3-4. Why must I hide from myself...when I need the crowd? Bring on the crowd. I love this crowd."
And the band brings everything back up with Bono in full crowd ass-kiss ecstasy: "THIS IS MY HOMETOWN! HELP ME! HELP ME!" Problem was, nobody cleared the copyright, and when Under a Blood Red Sky was released, Sondheim sued. The band ended up paying $50,000 and ensure that all future releases of the album would have the SITC bit edited out.