Singing was king last night as both American Idol and the musical episode of Grey’s Anatomy scored big in the ratings.

ABC’s Grey’s Anatomy (4.8/12, 12.7 million) was up from last week by a whopping 30% in 18-49 and 2.4 million viewers, despite its lead-in, Wipeout (1.9/8), falling 17% to tie its season low. Not much of a Grey’s bump for Private Practice (2.7/7), which was up only 4% from last week.

American Idol’s result show (6.7/10, 22 million) was also up from last week, by 5% in 18-49 and 3% in total viewers. Howie Mandel’s new flash mob reality special for Fox Mobbed (3.8/10) drew the largest audience and posted the highest retention for a reality show following Idol in two years.

CBS’ series were down across the board. The Big Bang Theory (3.6/12) was down 5% from its last original on March 10 for a season low. Rules of Engagement (2.3/7) was down 18%, also for a season low. CSI (2.8/7) was down 10%, The Mentalist (2.8/7) down 3%. NBC aired only one original, comedy Perfect Couples (1.0/3) at 8:30 PM, which was down 38% from last week, when it had an original lead-in, to post a series low.