Even if you ve paid £30 or more for the best set of guitar strings on the best guitar in the world they ll never sound good if you dont take the time to tune up...
If you mean this about the hard tension strings, they take about a month to settle in. It's hard to consistently keep them in tune for the first few days
For some reason people get scared that hard tension strings will damage a guitar neck. Most guitars, even budget ones like cordoba C5 have stronger necks than you’d think.
Hard tension strings are harder to play, and they sound brighter, but they also allow for lower action, as they don't move (buzz) around that much. The medium and low tension strings are quite the opposite.
It is called a Pasodoble. Its the start of many bull fighting piece's of music. Its like the track El Matador. You just go up and down the high E string in E. Most Bull fighting Spanish music starts with this rift.