Without your instruction, I would not have made such great progress.
要是没有你的指导，我不会取得如此大的进步。
The disadvantages include the songs may not be the ones you desire to learn and the instruction is more general without any way of knowing where you are in your musical journey.
缺点包括歌曲未必是你的愿望，学习和教学更一般没有任何办法知道你在哪里在你的音乐之旅。
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