We offer up song suggestions for the top nine. By Eric Ditzian “American Idol” top 9 Photo: FOX Last week on “American Idol,” it was all Elton John , all the time. On Wednesday (April 6), the contestants get to open up more than one songbook, because this week’s theme is based on the Rock and Roll Hall of Fame’s Songs that Shaped Rock & Roll exhibit. They’ll be able to cover everyone from Jefferson Airplane to Jane’s Addiction, the Moody Blues to the Red Hot Chili Peppers, the 5 Satins to the 4 Seasons, plus Kings B.B., Carole and Ben E. But with great variety comes great responsibility. Here’s what we’d like to from the remaining nine hopefuls: Casey Abrams With a cleaned-up beard on his face and a fire lit under his butt following a near-exit, Abrams stormed back into the mix with last week’s most emotionally resonant take on Elton. We pray he learned his lesson and will show similar vocal restraint Wednesday. He’s got a lot of soulful singers to choose from — Sam Cooke, Ray Charles — but one tune jumped out to us: Jimmy Cliff’s “Many Rivers to Cross” could turn into a much-needed “moment” for Abrams. Haley Reinhart Will she pull a Jacob Lusk, or can Haley build on her showstopping performance last week and stake a claim as a potential dark horse? A few weeks ago, Lusk busted out a stunner then followed it up by regressing back to the barely controlled eruptions he calls singing. Haley will once again have to show off those growls, but she can’t over-rely on them. The perfect song for her is the Allman Brothers Band’s “Whipping Post” — except instead of going with intense Southern rock,
