I don't believe that needs to be an online database to get song data. The data is in the song file. It's probably called ID3 or something. Of course, you can write a program to extract the ID3 data and put it into a database.

ID3
ID3 is a metadata container most often used in conjunction with the MP3 audio file format. It allows information such as the title, artist, album, track number, and other information about the file to be stored in the file itself. There are two unrelated versions of ID3: ID3v1 and ID3v2. ID3v1 takes the form of a 128-byte segment at the end of an MP3 file containing a fixed set of data fields. ID3v1.1 is a slight modification which adds a "track number" field at the expense of a slight shortening of the "comment" field. ID3v2 is structurally very different from ID3v1, consisting of an extensible set of "frames" located at the start of the file, each with a frame identifier and one piece of data. 83 types of frames are declared in the ID3v2.4 specification, and applications can also define their own types. There are standard frames for containing cover art, BPM, copyright and license, lyrics, and arbitrary text and URL data, as well as other things.Wikipedia



>Yupp, as the title is shown in the car it must be encoded on CD as well. Have never really looked into that, but probably lots of tools exist that can automatically set correct (song)file names. For the rest there HAS to be some online database to scrape ;-)
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