A creeping sound, like the background noise of a dark, lonely forest in late autumn (with leaves blowing and all). That's how Petrels' Haeligewielle starts. The mood is instrumental, slightly abstract and fully cinematic.

It's quite interesting how some of the songs fade into the other one, making it a true album experience. The very dreamy 'Silt', with it's expansive soundscape bleeds slowly into 'Canute', which follows the stylings for a while until it descends into a glitchy atmosphere, where strange little bleeps jump into different sides of the mix while a seeping synth goes into full crescendo. The distorted atmosphere is akin to what Belong has done before, but never copying, just thinking on the same page.

Patience is required in this album. All songs take their time, but they are building up towards something, a musical climax; a zenith to reach. 'Concrete' starts slowly, with a chorus buried in the mix sounding equal parts beautiful and scary (like a rite) until a barrage of strings saturate your ears . There is a wall of sound here, it just isn't achieved with distortions, only with layers upon layers of musical bricks (and maybe a lot of reverb, although I'm probably wrong).

There's some sweetness, in a short burst if your attention so does desire. 'Winchester Croydon Winchester' is musically simple, like a toy musical box, droning with a glockenspiel and a machine like sound. The occasional playful arpeggio makes it a very light song, bubbly perhaps. It's a short one gets you ready for the end of the album, which takes form in a mammoth 15 minute piece. 'William Walker Strengthens the foundation'. Crazy name, marvellous atmospheres and a heck load of stuff happening. There's organic instrumentations, a lot of electronic loops, synth seeping in and out and although it can be a little discomforting at first, it really grows on you.

Great atmospheres filled with beautiful, dreamy drones, interesting song titles ('The statue is unveiled with the face of another') and a veritable cornucopia of instruments being used in creative ways, Petrels' album Haeligewielle is a keeper. It might be only 7 songs (lucky number 7) but you get an interesting experimental ambient experience which can make your imagination go wild and think of a grainy film you'd never seen.