Local souvenirs;catalan/spanish music {Serrat};spanish/valencian music{Camilo Sesto}.In Sitges unlike nearby Barcelona all of the shops are allowed to open on Sundays. You will find a wide range of fashion stores around the city. Several of them carry top brands. Pedestrian streets on the city center get quite crowded on Sunday afteroons with tourists and people from Barcelona buying. Be aware that several shops on the afternoon open just after 17:30 and stay open untill 21:00.
