Jungle drums inspire nearby towers to attack faster, increasing attack rate by 15%
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~ BMC Flash description
Jungle Drums is the 2nd upgrade for the Monkey Beacon in BTD4 and the second upgrade of path 1 for the Monkey Village in Bloons TD 5. In BTD4, Jungle Drums cost $1275 on Easy, $1500 on Medium, and $1600 on hard. In BTD5 it also costs $1275 on Easy, $1500 on Medium, $1620 on Hard and $1800 on Impoppable. It increases attack speed of all towers in its radius by 17.6% (15% faster attack cooldown). Towers that attack every four frames or faster, like Spectre, Sun God, and Ray of Doom are unaffected (BTD5 Flash only).
In Bloons TD5 Mobile, upgrading Attack Speed to Level 8 in the Monkey Lab will allow all towers to "be under the effect of Jungle Drums". This can stack with this tower upgrade, making it very efficient (and even more efficient with a Specialty Building upgraded to Tier 2, if it increases attack speed).