It's been sixteen years since The Avalanches released Since I Left You and for a long time the notion of a follow-up has seemed like nothing but a cruel joke but after the delays, the divisive live shows and the suitably weird lead single, a follow-up has arrived. Wildflower is a psychedelic sonic trip that takes in hip-hop, oddball pop, funk, soul and disco along the way. Much like its predecessor, songs flow from one to the next, the effect being like a spectre floating from one party to the next, different songs bleeding into each other along the way.

Opening with the sound of live music playing out over a crowd of voices, Wildflower seems perfectly suited to being a summertime release. It's filled with bright optimism but still manages to channel the bittersweet platitudes of 'Since I Left You'. So whilst the defiant self celebration of 'Because I'm Me' which pairs hip-hop duo Camp Lo, with effervescent funk will stick in your head, it's the emotive qualities of 'If I Was A Folkstar' and 'Sunshine' that'll take your heart.

It's in these tracks that The Avalanches play with ideas of nostalgia. The Toro y Moi-featuring 'If I Was A Folkstar' sees the singer reminiscing about a time when he and his wife-to-be dropped LSD on a beach. The hazy, looped instrumentals blend perfectly with Bundick's vocals in which he pleads to stay in that moment forever ("let's stay here until we die"). 'Sunshine' meanwhile starts with heady optimism, but its key refrain of, "but then you went away / turning my blue skies grey" reveals an underlying heartbreak - and perhaps a subtle joke about the band's disappearance following Since I Left You.

However, Wildflower is not without its problems. 'Frankie Sinatra' still sits rather awkwardly - and its early appearance on the record might be off-putting to those who took an immediate dislike to the track. It's a good deal better than the obnoxious 'Noisy Eater' though. This Biz Markie featuring track feels like a close relation to Gorillaz' 'Superfast Jellyfish' complete with cartoonish rhymes and chaotic instrumentals. Biz Markie does a decent job, but the samples of people eating and comedian Jerry Lewis quickly grate and disrupt the flow of a record that had - up until this point - been nearly seamless in moving from one sound to the next.

It also feels much longer than it is. Part of this might be due to the fact that 'Frankie Sinatra' and 'Noisy Eater' aside, the album has a very mellow groove. Whilst Since I Left You found variety in the oddball 'Frontier Psychiatrist', the exuberant 'Electricity' and the beautiful trio of 'Etoh', 'Summer Crane' and 'Little Journey', Wildflower leans a little too heavily on breezy summer vibes. Sure they manage to uncover a variety of emotive depths across the record, but it means that songs don't just flow into one another, they blur. The end result is a second half which, at least for the few listens, lacks significant impact - a shame as it's home to some of the album's best tracks, like the aforementioned 'Sunshine', the dreamy 'Livin Underwater (Is Something Wild)' and the screwy 'The Wozard Of Iz'.

Overall though Wildflower shows that The Avalanches have done what many thought impossible - they've released a much-delayed follow-up to an adored record that's actually worth the wait. This is no Chinese Democracy, that's for sure. Wildflower might not be perfect, but it is gorgeous, heartwarming and fun. Its upbeat outlook is infectious and sure to be the soundtrack to many summers to come.