And with an limitless number of tracks there's no risk of running out of material.
But a number of tracks have already been leaked on the Internet.
But there are limitations, such as the number of tracks by a single musician that can be played during a set period.
And we are currently working on a number of tracks ourselves in that we have a diplomatic track to forge, as the President said, a common response from the international community.
But the project's current phase also includes replacement of five two-track bridges, which required reducing the number of active tracks from four to two.
Construction in that area has reduced the number of active train tracks from four to two over a seven-mile stretch there since March 2012.
Over the last 25 years an increasing number of dedicated cycle tracks and parks have sprung up in both town and country, many developed by bike clubs and other community groups.
Even so, the number of 99-cent tracks sold by these companies remains dwarfed by the free downloads still available using the likes of KaZaA and Grokster.
Thanks to Bitcasa, they can now store an unlimited number of remixes and dance tracks.
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Yet the number of arrests in Sublette county, which has almost quadrupled since 1995, closely tracks the rise in the number of rigs.
It tracks the number of Gogo-equipped flights that take off from each airport.
It tracks the number of sale contracts that have been signed - something that typically occurs 45 to 60 days before the sale is completed.
Rockwell, among many other things, tracks the number of patents filed.
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While no one tracks the number of regional or independent broker-dealers that have gone out of business, analysts who track the industry say that at least a dozen have closed their doors due to insufficient capital or issues with complex investments like private placement in just the last six months.
Though the game centers around racing, there are a number of levels where there are no tracks at all.
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Though no one tracks the total number of noninvasive or minimally invasive surgeries across the board, medical device makers say the trend is similar for other types of surgery as well--be it to relieve back pain, implant coronary stents, or shrink the stomachs of very obese people.
That's a tiny amount of tracks compared to the number of footpaths open to walkers.
Several officials at the tracks Monday morning wondered whether the number of commuters would pick up Tuesday once passengers saw how things went.
The following list represents the most viral tracks on Spotify, based on the number of people who shared it divided by the number who listened to it, from Monday, May 13, to Sunday, May 19, via Facebook, Tumblr, Twitter and Spotify.
However, downloading tracks did lead to a significant drop in the number of singles being bought, with just 13% of the 500 people surveyed saying they went on to buy singles in shops after getting them on the internet.
Edmunds.com tracks average days to turn, which is the average number of days vehicles were in dealer inventory before a customer drives them away.
The reason for this is believed to be to stop cancer in its tracks by preventing tumour cells from dividing more than a certain number of times. (Successful cancers often have a special enzyme that repairs telomeres.) The cost is that, eventually, even healthy tissue cannot renew itself.
"Ultravox's Vienna has beaten off some truly great, classic tracks to claim the title of the UK public's favourite number two single, " said Mr Talbot.
For perspective, we turn once again to the chart that tracks the percentage of job losses during every postwar recession and the number of months it took to get back to par.
According to Iraq Body Count, which tracks casualties and provides at least an indicator of trends, the number of people killed in 2012 (4, 573) was only slightly below the 5, 102 killed in 2009.
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The National Ballistics Intelligence Service, which tracks guns through bullets and shell casings, reckons that the total number of illegal firearms in the country is no more than 30, 000-40, 000, and the number in active use is far lower.
The number of jobs added last month was worse than the most pessimistic forecast tabulated by Econoday, which tracks economic information.
Pettine now tracks nearly every aspect of his coaching life in Microsoft Excel, including the number of times his players run each play in practice.
Trulia even tracks local price reduction trends like percentage of properties with price cuts, average discounts and average number of days before a cut.
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Around 35% of music consumers now download tracks legally, according to a recent survey from Entertainment Media Research, a consultancy (though the number of users offering illegal files has also grown, to 8.6m compared with 6.2m a year ago).
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