diff --git a/tastytrade/tastytrade.py b/tastytrade/tastytrade.py
index eea2581..804d9a7 100644
--- a/tastytrade/tastytrade.py
+++ b/tastytrade/tastytrade.py
@@ -3,6 +3,8 @@ import json
 import requests
 import websockets
 
+from datetime import datetime
+
 class Tastytrade:
 
     def __init__(self, username: str, password: str = None) -> None:
@@ -73,7 +75,7 @@ class Tastytrade:
         response = await ws.recv()
         return json.loads(response)
 
-    async def stream_market_data(self, symbols: list) -> None:
+    async def stream_market_data(self, subscription_message: dict) -> None:
         token_response = self.get('/api-quote-tokens').json()
         api_quote_token = token_response['data']['token']
         dxlink_url = token_response['data']['dxlink-url']
@@ -83,12 +85,6 @@ class Tastytrade:
             setup_response = await self.setup_connection(ws)
             auth_response = await self.authenticate(ws, api_quote_token)
 
-            # For some reason, the auth response is always unauthorized yet subsequent requests work.
-            # if auth_response.get('state') != 'AUTHORIZED':
-            #     print('Authorization failed.')
-            #     return
-
-            # Request new channel for Quote (and Greeks) events
             channel_request = {
                 'type': 'CHANNEL_REQUEST',
                 'channel': 1,
@@ -98,20 +94,35 @@ class Tastytrade:
                 }
             }
             await ws.send(json.dumps(channel_request))
-            channel_response = await ws.recv()
+            await ws.recv()
 
-            subscription_message = {
-                'type': 'FEED_SUBSCRIPTION',
-                'channel': 1,
-                'add': [{'symbol': symbol, 'type': 'Quote'} for symbol in symbols]
-            }
             await ws.send(json.dumps(subscription_message))
-            
             async for message in ws:
                 data = json.loads(message)
                 if data["type"] == "FEED_DATA":
                     # TODO: Have the caller provide a callback function to handle the data.
                     print(data)
 
-    def start_streaming(self, symbols: list):
-        asyncio.get_event_loop().run_until_complete(self.stream_market_data(symbols))
\ No newline at end of file
+    def create_quote_subscription(self, symbols: list) -> dict:
+        return {
+            'type': 'FEED_SUBSCRIPTION',
+            'channel': 1,
+            'add': [{'symbol': symbol, 'type': 'Quote'} for symbol in symbols]
+        }
+
+    def create_historical_data_subscription(self, symbol: str, period: int, type: str, from_time: int) -> dict:
+        candle_symbol = f'{symbol}{{={period}{type}}}'
+        return {
+            'type': 'FEED_SUBSCRIPTION',
+            'channel': 1,
+            'add': [{'symbol': candle_symbol, 'type': 'Candle', 'fromTime': from_time}]
+        }
+
+    def stream_quotes(self, symbols: list):
+        subscription_message = self.create_quote_subscription(symbols)
+        asyncio.get_event_loop().run_until_complete(self.stream_market_data(subscription_message))
+
+    def stream_historical_data(self, symbol: str, period: int, type: str, from_time: datetime):
+        from_time_unix = int(from_time.timestamp())
+        subscription_message = self.create_historical_data_subscription(symbol, period, type, from_time_unix)
+        asyncio.get_event_loop().run_until_complete(self.stream_market_data(subscription_message))
\ No newline at end of file