Midrash sur Les Nombres 26:18

The Israelites sang ten songs because of the ten miracles performed in their behalf. The first was in Egypt, as is said: You shall have a song as in the night when a feast is hallowed (Isa. 30:29). The second was at the Red Sea, as it is said: Then Moses sang (Exod. 15:1). The third was at the well: Then Israel sang this song (Num. 21:16). The fourth took place when Moses said: And it came to pass when Moses had made an end of writing (Deut. 31:24). The fifth: Then spoke Joshua to the Lord (Josh. 10:12). The sixth: Then sang Deborah and Barak the son of Abinoam (Judg. 5:6); the seventh: And David spoke unto the Lord the words of this song (II Sam. 22:1); the eight: A song at the dedication of the House; of David (Ps. 30:1). Did David actually dedicate the House (Temple)? The fact is that Solomon dedicated it, but inasmuch as David had set his heart upon erecting it, the song of dedication was ascribed to him. A similar example is contained in the verse And his sister stood far off (Exod. 2:4). Was she not the sister of both of them? Indeed she was, but inasmuch as she had devoted herself to Moses’ welfare, she is referred to by his name. Another instance of this is contained in the verse And the two sons of Jacob, Simeon and Levi, Dinah’s brothers took (Gen. 34:25). Was she not the sister of each of the tribal ancestors? She was indeed, but because these two had devoted themselves to her welfare, she is mentioned with their names. Another illustration is contained in the verse Cozbi the daughter of the chief of Midian, their sister (Num. 26:18). Was she actually a sister to all of them? (Hardly!) She was called their sister because she was deeply devoted to her people.