Even though flamenco guitar music has such a strong character that it seems totally unique it still shares some large common similarities with other forms of music.
If we compare flamenco with Jazz for example we see that both art forms have improvisation at their hearts while being loosely based around well established frameworks.
In Jazz those frameworks are standard songs from the Great American Songbook while in flamenco they are from a number of broad song forms established hundreds of years ago.
Just as that you can learn to improvise within Jazz so too can you learn to freely express yourself in flamenco.
Spanish guitar lessons are just another way of saying flamenco guitar and should you not be able to find a local teacher then turning for help online is the next best thing.
There are also books, CDs and DVDs however you need to be sure that you are purchasing something which is going to suitable for your current level of playing as learning Spanish guitar can be made quite complicated if the teacher is taking the level of his students for granted.
You'll find that there are a number of differences between flamenco and regular western pop music too.
One of the most striking of these is the use of rhythm in flamenco and where the accents are placed.
While pop music is quite square in 4/4 time, Spanish music for guitar is often counted over 12 beats with numerous accents falling during each measure.
When you learn flamenco guitar online one of the first challenges will be to memorize and better yet, internalize these meters and accents until they feel very natural.
Only then will your playing sound authentic.