Welcome, Belegorn.
I wouldn't say that the Istari, with the exception of Gandalf, "failed in their task".
The purpose for which they were sent was indeed accomplished in the end, and I think all probably played some part in that success.
However, obviously all but Gandalf (and possibly the Blue Wizards, who went to the East and never returned) could be said to have to a greater degree, like Saruman, or a lesser, like Radagast, gotten distracted in varying ways, and lost their focus. The Blue Wizards are too little-known for the level of their success or failure to be gauged.
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Music alone proves the existence of God.
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