SDN48 was the "adult" sister group of AKB48. It was composed of the most talented singers and dancers that have ever been assembled. This album has 17 of their biggest hit songs from Kodoku na Runner to Yaritagariyasan and Ai yo, ugokanaide ( the solo by the awesome Nishikunihara Reiko). It has great beats and excellent vocals. Some of the songs are lyrically a little depressing ( abazure), not to say that is bad, but the music videos really do not give that impression unless you understand spoken Japanese. If you are interested in Japanese Pop Music I highly suggest you give SDN48's "Next Encore" your consideration.