Long-distance running confined area. Early tracks were usually on flattened earth or were simply marked areas of grass. The style of running tracks became refined during the 20th century: the oval running tracks were standardised to 400 metres in distance and cinder tracks were replaced by synthetic all-weather running track of asphalt and rubber from the mid-1960s onwards. It was not until the 1912 Stockholm Olympics that the standard long-distance track events of 5000 metres and 10,000 metres were introduced. Long-distance road running competitions are mainly conducted on courses of paved or tarmac roads, although major events often finish on the track
Lap steel guitar uses a modified C6 tuning, with a B in the bass: "B-E-G-A-C-E". Jerry Byrd has a C6 variant with C# in the bass: C# E G A C E. Dobro players also generally use a set of strings with different gauges than those used on standard electric or acoustic guitars to help them to project more sound and to achieve their higher tunings. Many Western Swing lap steel players, and some Old-Time Country lap steel players, use a C6 tuning. There is no "standard" C6 tuning; one popular one is "C-E-G-A-C-E". This tuning is a good one for learning Don