1)
Who should sing?
1.
Malbim (Tehilim 105:2): Bnei Yisrael.
2)
Why does it say "Shiru" and "Zameru"?
1.
Radak: Sing vocally, and with an instrument.
3)
What wonders should people discuss?
1.
Radak (Tehilim 105:2): Wonders of the Aron and other wonders that He did with you.
2.
Malbim (Tehilim 105:2): They are supernatural wonders.
