What is this bird making the sound in the background?

[Rotarran]

So this link is to the page of the Chestnut Sided Warbler but when I click on the "Listen" button, I hear a bird in the background that I also heard out in nature but wasn't able to identify.  Was just wondering if anyone knows what it is.  This was near Barrie so it should be common (ish) but I just can't seem to match the sound with any warbler.

https://www.allaboutbirds.org/guide/Chestnut-sided_Warbler/overview

So it's the one in the background going: ta ta ta tee ta

[Ally]

I hear some bee/fly and a Robin. Another chestnutsided in distance.