BBC entertainer Justin Fletcher’s child-friendly synth-pop ditties have always had designs on the dance floor, but he ups the EDM ante on Just Party. On the title track, he brings the modern nightclub experience to the bouncy castle with hi-NRG beats, pulse-pounding synths and an exuberant shout-along chorus, fashioning a fist-pumper for the tiniest of hands. But Fletcher is also eager to get parents in on the fun, delivering faithfully rendered updates of feel-good classics like “La Bamba” and “Ghostbusters”.