Ring Tones Text Transfer Language (RTTTL) is a simple text-based format used to create ring tones for a mobile phones, developed by Nokia.

An example of a RTTTL string is

Looney:d=4,o=5,b=140:32p,c6,8f6,8e6,8d6,8c6,a.,8c6,8f6,8e6,8d6,8d#6

Whilst it started as a mechanism for defining and distributing ring tone, RTTTL is useful to more generally encode and playback simple tunes, and this library simplifies the parsing and playing of these tunes using either

self management of all playing control
library management with callback to user code for note generation

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