Music The term Twiddly Bits is commonly used in the music industry to describe a short improvised part that is technically advanced and/or musically interesting. [6, 1, 5]. In music, a Twiddly Bit is similar to a solo though it is typically shorter and lacks the structure typical of a solo, that is to say a beginning, middle and end. Rather it is short and sweet and can serve to fill space, act as a turnaround between parts, or as a substitute for a solo where a musician wants to show off but time does not allow for a full solo.
MIDI Samples Twiddly.Bits is a brand of MIDI samples developed in 1993 by Keyfax, a company co-founded by keyboardist Julian Colbeck and Dave Spiers; the name suggested by fellow British prog rock keyboardist, Dave Stewart.  Twiddly.Bits MIDI samples derive their name from the slang, as they are literally short, 1-to-2-measure, technically advanced performances from professional studio musicians recorded as MIDI . The Twiddly.Bits MIDI sample brand was originally conceived to make available to musicians and composers musical MIDI loops that could not be played on a standard MIDI keyboard controller due to the limitations of keyboards in duplicating instrument-specific nuances and timbres, such as a trill from a saxophone or a dynamic drum roll . The parts were recorded using the appropriate MIDI controller so these nuances and characteristics specific to the particular instrument in question would come through, making them the most authentic and realistic-sounding MIDI samples available [10,11]. They were the first of the MIDI sample brands  and are offered in over 20 different volumes in different genres and musical styles . They are also one of the most popular and best recognized of these brands [7, 4, 8] that have been used in thousands of commercial recordings and scores since their inception .
SOURCES: 1. Bass Heroes; Tom Mulhern, GPI Books, 1993, p.139.
2. The BFG; Roald Dahl, Puffin Books, 1982, p.43, 51.
3. Cambridge International Dictionary of English; Cambridge University Press, 1995, p.1573.
4. Complete Guide to Remixing; Erik Hawkins, Berklee Press, 2004, p13.
5. Genesis: Chapter and Verse; Banks, Collins, Gabriel, Hackett, Rutherford, Edited by Philip Dodd, Thomas Dunne Books, 2007, p.QQQ.
6. Guerilla Guide to the Music Business, 2nd Edition; Sarah Davis and Dave Laing, Continuum International Publishing Group Inc., 2006, p.145.
7. Guitarist’s Guide to Computer Music; Robin Vincent, Muska & Lipman Publishing, 2003, p.74.
8. Practical Recording Techniques, 4th Ed.; Bruce and Jenny Bartlett, Focal Press, 2005, p.392.
9. Valve Amplifiers, 3rd Edition; Morgan Jones, Elsevier Ltd., 1995, p.473.
10. Julian Colbeck, CEO Keyfax NewMedia, Inc.