Looking for a Search App that only searches my device. So If I want to find a pdf file that was emailed to me, or a contact, a calendar event or even a mp3 file. I am hoping to enter part of a song file name and it will show me all mp3s that match. If I do a search for a PDF file I would like it to show me all pdfs on my device and sort them by date if possible. Does such a search app exist?