4 out of 5.But like any good Muppets film, the real star is the music. Songwriter (and one-half of Flight of the Conchords) Bret McKenzie — who won an Oscar for his work on the previous Muppets film — has outdone himself this time, with a hilariously infectious line-up of songs that bests the previous film in every regard. Each of the three main human cast members also gets to belt it out in their own tune: Ricky Gervais bemoans how "life's gone to the dogs when your boss is a frog", in 'I'm Number One'; Tina Fey sings the praises of Gulag 38B, in 'The Big House'; and Ty Burrell probes the Muppets for the truth, in 'Interrogation Song'. There's even a collaboration between Miss Piggy and Céline Dion that has no right being as funny as it is; and McKenzie's Flight of the Conchords partner, Jemaine Clement, delivers a rousing rendition of 'Working in the Coal Mine'. And although the film's musical finale, 'Together Again', doesn't quite hit the high notes it should, the high-water mark set by Constantine's Flight of the Conchords-esqe dance ballad, 'I'll Get You What You Want (Cockatoo in Malibu)', makes it easily forgivable.
This is a great film to pick yourself up out of a bad mood. Just lots of silly fun and amazing songs, especially if you're a Flight of the Conchords fan. I thought it absolutely blew away the songs from the previous Muppets film. More in my full review.