Where can I buy the music they play in hollister and h&m?
You need to find the name of the song and artist to buy them. Alternatively, you can ask the customer care in the stores for more details about the songs. You can also listen to some of the songs at http://www.last.fm/tag/hollister and http://www.last.fm/tag/songs%20which%20are%20played%20in%20hm%20stores.
The ones near me have those artist CDs for sale I'll near the registers