Rootin' Tootin' Trumpet Sounds!! This sheet will play a Mexican Trumpet note for you, as long you aren't in range of a boombox. Put it in different places for different pitches!
Sheet Music: Mexican Trumpet price in Growtopia: sells for about 5/WL (median of 15 offers from community Discords, past 30 days). Live price chart and the latest buy and sell offers.