The firm is also known for releasing a large number of compilation albums, with multi-genre compilation brands including the 'Absolute Hits' series of single-disc collections (through Crimson) and the budget-range '100 Hits' series of five-disc box sets each themed to a particular genre or era of music. These have proved successful, with the 100 Hits series alone amassing sales of 1.5 million units in its first 18 months on sale. The firm also releases genre-based compilation sets through labels such as "Harmless" (funk) and "Nascente" (world music).