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Wikipedia definition
1. TruetoneA truetone is a ringtone which has been encoded with a sampled audio format such as MP3, AAC, or WMA. It is also referred to as a mastertone or realtone. Ringtones started the mobile content market by demonstrating a demand for customization, initially amongst teens but then extending into the mass market. The first generation of ringtones were monophonic instrumental renditions of popular and sometimes original tunes.
Read “Truetone” on English Wikipedia
Read “着うた” on Japanese Wikipedia
Read “Truetone” on DBpedia

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