Final answer:
Giuseppe Verdi was the 19th-century Italian opera composer who blended recitative and aria for continuous drama and effectively used brass at climatic moments.
Step-by-step explanation:
The 19th-century Italian opera composer who erased the boundaries between recitative and aria, favoring a more continuous flow of dramatic action, and was most inclined to use brass at climaxes is Giuseppe Verdi. Verdi's operas are known for their emotional intensity, complex characters, and dramatic structures that avoided the strict separation of recitative and aria. This innovative approach allowed for a more seamless storytelling in his operas. As for his use of the orchestra, Verdi was indeed recognized for his effective use of brass instruments to underline and amplify the drama's emotional peaks.