The Blessing of Torah

Rav Huna said: Before learning Tanach, you need to say the blessing over learning Torah.  But if you're just going to learn Midrash, you don't need to say it.

And Rebbe Elazar said: Whether you are going to learn Tanach or Midrash, you do need to say the blessing.  But if you're just going to learn Mishna, you don't need to say it.

And Rebbe Yochanan said: Even to learn Mishna, you need to say the blessing.  But to learn Talmud, you don't need to say it.

And Rava said: Even to learn Talmud you need to say the blessing.

(Brachot 11b)