A comprehensive icon set that includes more than 120 pixel icons in a variety of sizes from 16x16 up to 128x128, designed for a variety of uses from websites to apps. There are three icon packs available - all have the same icons in them, but some they include different file formats.
PNG Pack (free), includes icons in 4 sizes (16x16, 32x32, 64x64, and 128x128).
SVG Pack ($10), includes pngs, and svgs for all icons (the cd icon does not work as an svg).
Sketch Pack ($20), includes icons as png, svg, and the sketch files - so you can edit them and add new icons that fit the same style.