Barenaked ladies biggest hit

Answer 1

The Barenaked Ladies biggest hit is One Week.

From Wikipedia:

"One Week" is the band's best best-performing single on the charts in both the United States and the United Kingdom, though it slightly under-performed several other singles in the band's native Canada. It was the band's first and, as of 2009, only number one single in the U.S. on both the Hot 100 (for one week) and the U.S. Modern Rock Tracks (for five non-consecutive weeks). Both "The Old Apartment" and "Brian Wilson" barely broke the top 100 of the US chart. The band's US chart success has not been equalled, and was neared only by followup single "It's All Been Done", and "Pinch Me", the first single off followup album Maroon; Both broke the top 50 of the U.S. Hot 100.

Now this is not to say, that this is their BEST song... just their biggest hit.

Answer 2

The Barenaked Ladies' most popular song is considered to be "Brian Wilson." A very close second place song is "If I Had 1,000,000." Also making the list is "One Week," "Sound of Your Voice," and "Call and Answer."