It's early days yet for 2015, and the summer festival season is still a way off, but the main stages and smaller tents at the world's heaviest festivals are already starting to fill up. So here are, in no particular order, our favourite 10 from those announced so far.
Placebo, Rise Against, Kodaline and Farin Urlaub Racing Team provide a crunching spine to OpenAir St Gallen, though there's a large pinch of electronic music too.
When and where: 25 - 28 June, St Gallen, Switzerland
The grandfather of rock and metal festivals, Download welcomes back perennial favourites Slipknot alongside Muse and KISS – both of whom are set for very busy summers.
When and where: 12 - 14 June, Derby, UK
Walking-dead glam from Rob Zombie and pony-tailed rock from Status Quo – Getaway Rock covers the whole spectrum.
When and where: 6 - 8 August, Gävle, Sweden
Indie/rock/punk/blues: delete as appropriate for a bill comprising The Black Keys, Patti Smith, The Strokes, Ride… and a lot more.
When and where: 27 - 30 May, Barcelona, Spain; 4 - 6 June, Porto, Portugal
As if legendary bearded blues-rockers ZZ Top weren't enough, Azkena Rock has Red Fang and Eagles of Death Metal thrown in to boot.
When and where: 19 - 20 June, Vitoria-Gasteiz, Spain
Placebo again, and this time joined by Of Monsters and Men, Black Rebel Motorcycle Club and a slice of indie-pop from Death Cab.
When and where: 22 - 24 June, Zagreb, Croatia
We told you Muse and KISS were working hard. Three debutant festivals have them alongside Metallica at the top of their lineup. Impressive stuff.
When and where: 29 - 31 May (Germany), 4 - 6 June (Vienna)
Reading and Leeds have only released a few names so far, but the Metallica-Royal Blood combo is already looking pretty tasty.
When and where: 28 - 30 August, Reading and Leeds, UK
Another varied lineup brings together Muse (yep), Lamb of God and Sabaton with Calvin Harris and Robbie Williams at Sweden's biggest music festival. Varied is definitely the word.
When and where: 25 - 27, Norrköping, Sweden
Mew, Muse (one last time), Enslaved and The War On Drugs are offset by a dash of electronic and hip-hop from Disclosure, Florence and the Machine and Pharrell Williams.
When and where: 27 June - 4 July, Roskilde, Denmark