transformation of sentences

[Tan Elaine]

1 I started playing the piano five years ago.
1(a) I have been playing the piano for five years.

2. I started to play the piano five years ago.
2 (b) I have played the piano for five years.

Are the sentences correctly transformed?

What is the difference in meaning between sentences 1(a) and 2(b)?

Thanks in advance.

[Clark]

1 I started playing the piano five years ago.
1(a) I have been playing the piano for five years.

2. I started to play the piano five years ago.
2 (b) I have played the piano for five years.

Are the sentences correctly transformed?

What is the difference in meaning between sentences 1(a) and 2(b)?

Thanks in advance.

Frankly speaking, I can't see any dependence between a gerund and present perfect continuous, on the one hand, and an infinitive and present perfect on the other..

[bhaisahab]

Personally I would use the continuous form for both sentences.