US TOP 100 SONGS app allows its users to view hot 100 chart available on billboard.com , on their android devices. Plus user can also listen to preview clips provided by 7digital.com If user wishes he/she can also buy track(s) from 7digital.com provided the track is available for selling purpose in user's geographical territory
BillBoard.com : For Tracks name and Artists name of music chart
7digital.com: For providing the Image,Preview ,Buy Link corresponding to track and artists
Graphicsfuel.com : For App Icon and Forward , Backward & No preview Available icons
Yellowicon.com : For media player control icons
NOTE: THIS IS NOT AN OFFICIAL BILLBOARD APP.