Here you can learn about the four pitched tones. The video has an interesting explanation with pictures for the tones. The video also features an annotation, the reason for having these tones is probably that the Chinese langauage has very few possible syllables – approximately 400 – while English has about 12,000.
This video (see at YouTube) is of beginner level difficulty. It has subtitles in Pinyin and Chinese characters.
10 videos by
Greeting and self-introductio... (beginner)
Watch to Learn Chinese: The C... (beginner)
Iron, kettle, TV, computer... (beginner)
>> more videos