I like the effect on the images used on this Spotify page, and out of curiosity I'm trying to replicate it in Illustrator. It's not a simple multiply mask, and seems a more involved than the kind of duotone I can do in inDesign.
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On paper, they'd be high-contrast duotones. Or, possibly monotones printed on colored paper with opaque inks (such as via screen printing).
Possible other ways to describe the effect would include:
Make a greyscale image, save as either a JPG or TIFF (doesn't work with EPSs) and import into InDesign. Colour the box as usual, and use the direct selection arrow to colour the image.
That's the sort of thing you can do with PS Gradient Map adjustment layers (#ff6438 and #2d3560 on the left, #513750 and #92dfd3 on the right).
This is called a duotone effect, the first one is a duotone effect that just has some texture added to it.
You can expand on this by trying out more colors, performing this on a texture and then overlaying on a photo or anything else.