recurring orchestral production music selections. "We had a music supervisor called Ray Espinola and we said, 'Give us everything you have in a sort of Leave It to Beaver with a big band-swing kind of feel,' and the majority of the songs are from what he sent over," Charlie Day explained. "When you set it against what these characters were doing—which often times can be perceived as quite despicable, or wrong—it really disarmed the audience. It just became our go-to library of songs." The theme song is called "Temptation Sensation" by German composer Heinz Kiessling. Kiessling's work ("On Your Bike" and "Blue Blood") can also be heard during various scene transitions throughout the show, along with other composers and pieces such as Werner Tautz ("Off Broadway"), Joe Brook ("Moonbeam Kiss"), and Karl Grell ("Honey Bunch"). Many of the tracks heard in the series are from Cafe Romantique, an album of easy listening production music collected by Extreme Music, the production music library unit of Sony/ATV Music Publishing. Independent record label Fervor Records has also contributed music to the show. Songs from The Jack Gray Orchestra's album Easy Listening Symph-O-Nette ("Take A Letter Miss Jones," "Golly Gee Whiz," and "Not a Care in the World") and the John Costello III release Giants of Jazz ("Birdcage," "Cotton Club" and "Quintessential") are heard in several episodes. The soundtrack, featuring most of the music heard on the show, was released in 2010. Soundtrack track listing Reception and legacy Critical reviews and commentary It's Always Sunny in Philadelphia has received critical acclaim for its humor and the performances of the cast. Emily Nussbaum of The New Yorker praised the show, calling it "not merely the best sitcom on television but one of the most arresting and ambitious current TV series, period." Gillian Flynn of Entertainment Weekly reviewed the first season negatively, commenting, "[I]t is smug enough to think it's breaking ground, but not smart enough to know it isn't." Brian Lowry of Variety gave the first season a positive review, saying it was "invariably clever and occasionally a laugh-out-loud riot, all while lampooning taboo topics." However, later seasons of the show have received favorable ratings on review aggregator Metacritic, receiving 70/100, 78/100 and 85/100 for seasons 4, 5 and 6 respectively. The show has become a cult hit with viewers and is often compared in style to Seinfeld—particularly due to the self-centered nature of its