Ef a tale of Melodies

the opening had slight changes every episode and english singing
but the on last episode it changes to japenese singing with new lyrics to the same song

such a good series

Next question:

Do you read the translations of the lyrics?
I did at first, but as they usually have very little to do with the story, I've since been getting a bit annoyed and usually don't read them anymore (the animations provide me more interest).